Originally Posted by tkfx
Aluminum is strong, but I think steel would last longer in the long run.
Care to elaborate on which grades and treatments you're referring to when making your claims?
I run a 1/4" 6061-T6 belly skid that's supported by steel crossmembers and 3/16" 6061-T6 corner guards and rocker guards that both use 3/8" 6061 backing plates.
The proper type of aluminum in the proper thickness with smart execution and fastening will hold up every bit as well as steel in the same applications while weighing a heck of a lot less. In fact, my old 1/4" steel belly skid was weaker than my current aluminum skid in terms of bending due more to design than material.