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A stackable mat includes a first industrial mat, a second industrial mat and an internal support structure. The mats each have a plurality of layers or plies of construction materials for forming the upper and lower portions, respectively, of the stacker mat, and have a thickness that provide suppor

A stackable mat includes a first industrial mat, a second industrial mat and an internal support structure. The mats each have a plurality of layers or plies of construction materials for forming the upper and lower portions, respectively, of the stacker mat, and have a thickness that provide support for vehicle movement thereover. The internal support structure includes a truss or elongated members for retaining the first and second mats in parallel spaced relation at a distance that is greater than the thickness of the first industrial mat. Preferably, the internal support structure and the second industrial mat or both the first and second industrial mats are configured with sufficient openings to allow water to flow therethrough so that the stacker mat may be placed in wet areas to form a temporary roadway or platform.

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1. A stacker mat comprising: a first industrial mat having a plurality of layers or plies of construction materials for forming the upper portion of the stacker mat, the first industrial mat made of materials and having a thickness that provide support for vehicle movement thereover;a second industr

1. A stacker mat comprising: a first industrial mat having a plurality of layers or plies of construction materials for forming the upper portion of the stacker mat, the first industrial mat made of materials and having a thickness that provide support for vehicle movement thereover;a second industrial mat having a plurality of layers or plies of construction materials for forming the lower portion of the stacker mat, the second industrial mat also made of materials and having a thickness that provide support for vehicle movement thereover;an internal support structure that includes a plurality of truss or elongated members for retaining the first and second mats in parallel spaced relation at a distance that is greater than the thickness of the first industrial mat, the second industrial mat or of both the first and second industrial mats; anda frame that includes plates, beams or an open truss structure, with the frame surrounding the internal support structure and connected to the first and second industrial mats at or near their peripheries. 2. The stacker mat of claim 1, wherein at least a portion of the plates or beams of the frame include openings or the open truss structure is present, and wherein the truss or elongated members of the internal support structure are spaced to allow water to flow between the first and second industrial mats so that the stacker mat may be placed in wet areas to form a temporary roadway or platform. 3. The stacker mat of claim 1, wherein the internal support structure includes elongated members comprising beams, columns, structures or layers of wood, engineered wood, thermoplastics, thermosetting plastics, elastomers, recycled plastic materials, steel, aluminum, stainless steel, copper or other metals, weighted composite material or any combination thereof. 4. The stacker mat of claim 1, wherein the internal support structure includes metal truss members made of steel, stainless steel, aluminum, copper, galvanized steel or a combination thereof. 5. The stacker mat of claim 4, wherein the truss members are connected by cross-members for additional strength in holding the first and second industrial mats in their parallel spaced relation. 6. A stacker mat comprising: a first industrial mat having a plurality of layers or plies of construction materials for forming the upper portion of the stacker mat, the first industrial mat made of materials and having a thickness that provide support for vehicle movement thereover;a second industrial mat having a plurality of layers or plies of construction materials for forming the lower portion of the stacker mat, the second industrial mat also made of materials and having a thickness that provide support for vehicle movement thereover;an internal support structure that includes a plurality of truss or elongated members for retaining the first and second mats in parallel spaced relation at a distance that is greater than the thickness of the first industrial mat, the second industrial mat or of both the first and second industrial mats, wherein the internal support structure includes metal truss members made of steel, stainless steel, aluminum, copper, galvanized steel or a combination thereof; anda frame that includes plates or beams that surround the truss members with the frame connected to the first and second industrial mats at or near their peripheries. 7. The stacker mat of claim 6, wherein the frame comprises plates having sufficient openings to allow water to flow between the first and second industrial mats so that the stacker mat may be placed in wet areas to form a temporary roadway or platform. 8. The stacker mat of claim 1, wherein first industrial mat, the second industrial mat or both of the first and second industrial mats comprises wood, engineered wood, a thermoplastic, a reinforced thermosetting plastic, an elastomer, solid, hollow or filled tubular components, encapsulated material, a composite material, or a combination thereof, any or all of which are optionally configured or treated to have water and environmental resistance. 9. The stacker mat of claim 1, further comprising lifting elements including D-shaped rings, O-shaped rings, chains or cables that are connected directly to the stacker mat to allow overhead lifting of the stacker mat, wherein the lifting elements are optionally coated, painted or treated to provide additional water and environmental resistance. 10. The stacker mat of claim 1, wherein the plurality of layers or plies of the first industrial mat and the second industrial mat comprises two or three layers or plies for each industrial mat. 11. The stacker mat of claim 10, wherein the first industrial mat and the second industrial mat each include two layers or plies, wherein the layers or plies are each about three inches in thickness with a modulus of elasticity of at least 1.6 Mpsi, and wherein each industrial mat has a load bearing capacity that is configured to withstand a load of at least 500 to 1000 psi without permanent deformation of the first and second industrial mats. 12. A stacker mat, comprising: a first industrial mat having a plurality of layers or plies of construction materials for forming the upper portion of the stacker mat, the first industrial mat made of materials and having a thickness that provide support for vehicle movement thereover;a second industrial mat having a plurality of layers or plies of construction materials for forming the lower portion of the stacker mat, the second industrial mat also made of materials and having a thickness that provide support for vehicle movement thereover; andan internal support structure that includes a plurality of truss or elongated members for retaining the first and second mats in parallel spaced relation at a distance that is greater than the thickness of the first industrial mat, the second industrial mat or of both the first and second industrial mats, wherein the internal support structure includes metal truss members made of steel, stainless steel, aluminum, copper, galvanized steel or a combination thereof;wherein the first industrial mat and the second industrial mat each include three layers or plies, wherein the layers or plies are each about two inches in thickness with a modulus of elasticity of at least about 1.6 Mpsi, and wherein each industrial mat has a load bearing capacity that is configured to withstand a load of at least about 500 to about 1000 psi without permanent deformation of the first and second industrial mats. 13. The stacker mat of claim 1, wherein the first industrial mat and the second industrial mat are configured to include an overall thickness of about 6 to about 8 inches, a longitudinal dimension of about 6 to about 40 feet, and a transverse dimension of about 6 to about 10 feet. 14. The stacker mat of claim 1, wherein the first and second mats are retained in parallel spaced relation at a distance of about 1 to about 3 feet. 15. The stacker mat of claim 1, the internal support structure is attached to the first industrial mat and the second industrial mat via bolts, screws or rivets and wherein the truss or elongated members have a modulus of elasticity of at least about 1.6 Mpsi, and wherein the truss or elongated members have a load bearing capacity that is configured to withstand a load of at least about 500 to about 1000 psi without permanent deformation of the truss or elongated members. 16. The stacker mat of claim 1, wherein the internal support structure is made of environmentally resistant materials to avoid deterioration of the internal support structure when repeatedly exposed to water. 17. A stacker mat comprising: a first industrial mat having a plurality of layers or plies of construction materials for forming the upper portion of the stacker mat, the first industrial mat made of materials and having a thickness that provide support for vehicle movement thereover;a second industrial mat having a plurality of layers or plies of construction materials for forming the lower portion of the stacker mat, the second industrial mat also made of materials and having a thickness that provide support for vehicle movement thereover; andan internal support structure for retaining the first and second mats in parallel spaced relation at a distance that is greater than the thickness of the first industrial mat, the second industrial mat or of both the first and second industrial mats;wherein the first industrial mat and the second industrial mat each include three layers or plies having a modulus of elasticity of at least about 1.6 Mpsi with each layer or ply comprising wood, engineered wood, a thermoplastic, a reinforced thermosetting plastic, a metal, an elastomer, solid, hollow or filled tubular components, encapsulated material, a composite material, or a combination thereof, any or all of which are optionally configured or treated to have water and environmental resistance,wherein each industrial mat has a load bearing capacity that is configured to withstand a load of at least about 500 to about 1000 psi without permanent deformation of the first and second industrial mats. 18. The stacker mat of claim 17, wherein the internal support structure includes elongated members comprising beams, columns, structures or layers of wood, engineered wood, thermoplastics, thermosetting plastics, elastomers, recycled plastic materials, steel, aluminum, stainless steel, copper or other metals, weighted composite material or any combination thereof. 19. The stacker mat of claim 18, wherein the internal support structure has sufficient openings to allow water to flow between the first and second industrial mats so that the stacker mat may be placed in wet areas to form a temporary roadway or platform. 20. The stacker mat of claim 17, wherein the support structure comprises support spacers make of beams or columns or multiple layers of wood, plastic, elastomer or metal materials.