I'm going for wheels on my old 6hp Campbell Hausfeld 60-gal. I plan to put 3"x1-1/4" total lock 300-lb capacity polyurethane casters ( http://www.amazon.com/dp/B00YHJC97W/?tag=atomicindus08-20 ) under a 28" square 2x6 flat frame, then mount the compressor on top of the 2x6's to allow some...