They may not be mh axles. Dexter did make de-mountable rim axles for commercial use. If you don"t belive just check their site. It may already have the breaks on it, if not buy 12" brakes with 5 hole mounting flange and en-large the hole. Redneck trailer has them on sale occasionally. Low boy tires are between $80-$120 for carlise depending on rating.