For the rear bumper... light, strong, and a hitch mount...
I would go with DOM, 3 tubes across the back. Mount them in a triangle, to the top has 2 tubes, and there is one across the bottom. Have a receiver built in between the upper and lower tube, and gusset the hole thing, and add plates at the end. the gap between upper and lower, could be filled with expanded metal, and still allow you to mount some reverse lights in there. Cover the gap at the top with diamond plate, sheet, or expanded metal.
Sorry, dont know how to make a picture for ya....
And as far as the TTB... yes and no. D44 outta a Bronco/F150 is ideal... the D50 mess is just that....
Chase