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An assembly for coupling a tractor to a trailer is disclosed. The assembly comprises a fifth wheel bearing plate and a trailer bearing plate assembly. The trailer bearing plate assembly includes a self-lubricating plate securely attached to an underside of said trailer by a chemical attachment means

An assembly for coupling a tractor to a trailer is disclosed. The assembly comprises a fifth wheel bearing plate and a trailer bearing plate assembly. The trailer bearing plate assembly includes a self-lubricating plate securely attached to an underside of said trailer by a chemical attachment means.

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1. An improvement to a replacement plate assembly for providing a low coefficient of friction surface between a truck tractor fifth wheel and a semi-trailer and attachable to an assembly for coupling a truck tractor to a semi-trailer comprising a housing having first and second pairs of parallel end

1. An improvement to a replacement plate assembly for providing a low coefficient of friction surface between a truck tractor fifth wheel and a semi-trailer and attachable to an assembly for coupling a truck tractor to a semi-trailer comprising a housing having first and second pairs of parallel end walls spaced by an upper coupling plate, the upper coupling plate has an upper surface, an exposed outer surface, and an opening, a plurality of reinforcement beams extend between the first pair of parallel end walls, a portion of a kingpin extends through the opening in the upper coupling plate, the improvement comprising: an attachment plate having a bonding surface and an opposing surface, the attachment plate adapted for secure attachment to the exposed outer surface of the upper coupling plate wherein the opposing surface is adjacent the exposed outer surface of the upper coupling plate; and a self-lubricating plate of a first material securely joined to the bonding surface of the attachment plate wherein the attachment plate is located between the self-lubricating plate and the exposed outer surface of the upper coupling plate. 2. The improvement of claim 1 wherein the self-lubricating plate is securely joined to the bonding surface of the attachment plate by a chemical fastener. 3. The improvement of claim 2 wherein the bonding surface includes a treated surface for providing a clean surface for receiving the chemical fastener and the self-lubricating plate. 4. The improvement of claim 2 wherein the attachment plate is welded to the upper coupling plate. 5. The improvement of claim 2 wherein the attachment plate is mechanically fastened to the upper coupling plate. 6. The improvement claim 1 further comprising a barrier member located on the exposed outer surface of the upper coupling plate and between a leading edge of the upper coupling plate and the self-lubricating plate. 7. The improvement of claim 6 wherein the barrier member comprises a front bar fixedly attached to the upper coupling plate. 8. The improvement of claim 2 wherein the chemical fastener includes a bonding agent. 9. The improvement of claim 2 wherein the chemical fastener is a chemical adhesive. 10. The improvement of claim 2 wherein the self-lubricating plate is formed of a plastic. 11. The improvement of claim 10 wherein the plastic includes an ultra high molecular weight polyethylene.