I apologize in advance for my crappy ms paint drawing!! Does your frame extend all the way to the rear of the coach? In most garage units the frame is where the red line is in my drawing. The area that I've filled in green is very strong and can support any weight the axles, wheels, and springs can take. The area in yellow can support a lot less weight without bucking your side walls, and it's carrying capacity depends on a sub-frame or trusses in the walls of the coach.
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