Like I was taught in the military...you travel light, you travel right. GO ALUMINUM! I'm pulling a 25' v-nose behind my 2012 1/2 ton. Walls, floor and ceiling are 16" centers, 3500lb axles (each), brakes, etc......2700lbs total. 3500lb car and I'm well within my 10,000lb capacity of my little 5.3.