Does anyone have experience (good or bad) using aluminum wheel spacers while hauling significant weight in truck bed? I have 2" aluminum wheel spacers on the rear of my truck and remove them each fall when I install slide-in truck camper (guessing approximately 2000lbs). I'd love to keep the spacers on there however I'm not certain of load capacity with spacers. Should I be concerned? Considered buy a set of steel spacers at $370.00 however hate to blow that much if it's unnecessary. Opinions welcome!