I've been repairing my camper and it still amaze me how cheaply those expensive toys are build.
My camper has aluminium frame, but only on the big edges. No aluminium on the floor.
Had to repair the overhang sides.
3/4" x1" frame (make it 3 pieces) with some siding and generator mount screw to it.
I am adding stainless steel plates whenever I open the joint.
They might add 20 lb of weight to the camper, but at least I know I will not leave generator on the highway in the middle of nowhere.