Mounting Generator on rear end

Square tube bumpers are made from 1/16 or thinner sheet metal. After bending into shape the seam is welded to finish the square tube. Even if fully welded to the frame the welds are thin to keep from melting through. When adding too much weight the tube will tear along the weld and if you are lucky it may still be barely attached while dragging the generator behind you. If adding that much weight you will need to have the genny platform welded directly to the frame. Single axle trailers have more bounce and sway than double axle trailers the same size. Bounce will contribute if not cause the bumper to tear along the welds.

As mebtioned adding weight to the bumper you will probably have to add weight at the front.