If I were to install a frame stiffener kit, do I have to remove the existing axle mounting plate (the one with the big holes that is welded to the frame just over the axles) or can I just bolt frame stiffener kit to the frame and leave the axle mounting plate in place?
The question is why is it sagging? Is the frame still attached to the rear of the trailer? It is common for corrosion and floor rot to cause the rear end to separate. The frame is very week without the body to support it. The 70's model trailers seem to have the most problems because of adding a gray water tank without increasing the strength of the frame. Once the frame separates from the body, the frame will bend.
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