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A modular trailer system is described, wherein a gooseneck, deck, and dolly are attachable to each other in a variety of ways. One configuration allows the gooseneck and dolly to be attached to either end of the deck. Another configuration allows the gooseneck and dolly to be attached directly to ea

A modular trailer system is described, wherein a gooseneck, deck, and dolly are attachable to each other in a variety of ways. One configuration allows the gooseneck and dolly to be attached to either end of the deck. Another configuration allows the gooseneck and dolly to be attached directly to each other. This permits the method of transporting a deck to a site, and then returning the gooseneck and dolly to another location.

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1. A modular trailer system comprising: a deck including: a first deck end,a second deck end, anda rectangular structure for supporting a load on the deck, where said rectangular structure includes two or more longitudinal structural elements extending along the length between said first deck end to

1. A modular trailer system comprising: a deck including: a first deck end,a second deck end, anda rectangular structure for supporting a load on the deck, where said rectangular structure includes two or more longitudinal structural elements extending along the length between said first deck end to said second deck end,a first cross-member located near said first deck end, where said first cross-member is welded to at least two of said two or more longitudinal structural elements, anda second cross-member located near said second deck end, where said second cross-member is welded to at least two of said two or more longitudinal structural elements;a gooseneck including a hook, where said hook of said gooseneck is removably connectable to said first cross-member when placed under said first cross-member; anda dolly including a hook, where said hook of said dolly is removably connectable to said second cross-member when placed under said second cross-member,such that when said gooseneck is connected to said first cross-member and when said dolly is connected to said second cross-member, the weight of said deck is supported by said hook of said gooseneck and said hook of said dolly,where at least a portion of said first cross-member and said second cross-member have a cross-sectional shape of the arc of a circle;where said hook of said gooseneck has a surface with a cross-sectional shape of the arc of a circle; andwhere said hook of said dolly has a surface with a cross-sectional shape of the arc of a circle. 2. The modular trailer system of claim 1, where said hook of said gooseneck is removably connectable to either said first cross-member when placed under said first cross-member or said second cross-member when placed under said second cross-member. 3. The modular trailer systemof claim 1, where said hook of said dolly is removably connectable to either said first cross-member when placed under said first cross-member or said second cross-member when placed under said second cross-member. 4. The modular trailer system of claim 1, where said gooseneck and said dolly are removably connectable to each other. 5. The modular trailer system of claim 1, wherein said at least a portion of said first cross-member is accessible through the deck, andwherein said at least a portion of said second cross-member is accessible through the deck. 6. The modular trailer system of claim 1, where said two or more longitudinal structural elements are I-beams. 7. The modular trailer system of claim 1, where said first cross-member and said second cross-member are tubes. 8. A deck for attaching to a hook of a dolly and a hook of a gooseneck, said deck comprising: a first deck end,a second deck end, anda rectangular structure for supporting a load on the deck, where said rectangular structure includes two or more longitudinal structural elements extending along the length between said first deck end to said second deck end,a first cross-member located near said first deck end, where said first cross-member is welded to at least two of said two or more longitudinal structural elements, anda second cross-member located near said second deck end, where said second cross-member is welded to at least two of said two or more longitudinal structural elements;where at least a portion of said first cross-member has a cross-sectional shape of the arc of a circle accessible through said first deck end, and where at least a portion of said second cross-member has the same cross-sectional shape of the arc of a circle as said portion of said first cross-member and is accessible through said second deck end,such that said portion of said first cross-member and said portion of said second cross-member present the same shape for connecting to the hook of the dolly or the hook of the gooseneck. 9. The deck of claim 8, where said two or more longitudinal structural elements are I-beams. 10. The deck of claim 8, where said first cross-member and said second cross-member are tubes.