From my 2021 travel trailer. I just purchased the trailer but wanted stronger, stiffer support. The oem 3,500lb axles were replaced with 6K Dexter axles and an additional leaf in the springs are the new equipment. For sale are the take-off Dexter axles with self adjusting elec brakes, and in addition to the axles there are four separate leaf springs, equalizers, shackles, and most of the hardware like the plates and even the u bolts (they usually are only used once, due to stretching). Four, nice aluminum wheels with decent if not good tread Goodyear tires are available, too. All or part, let me know what your interest is. How much for the axles? Good question, one new (6K) axle and two springs cost $1,155 for each set. How about $225 for each axle and spring set? A new 3,500 lb. axle with brakes at eTrailer goes for ranges about $700, not including springs, plates, hardware or shipping or taxes, etc.