Originally Posted by Cumminsfan
5th wheel slide outs aren't almost always 48". They never are 48". Norm is 36" for dinette/sofa slides. 24" for kitchen slides. some go 42". But never 48"
To the OP, just slide a thin piece of plywood under the front edge of the slide for more support.
First, I did not use the word 'always' , second, many are 44 to 42 inches which I at least consider is almost 48 inches, and finally kitchen slides at 24 inches are not relevent since they don't have seating.
You are right, plywood can be used under the slideout floor, but I'd need 3/4 inch thick and 11 ft length.