I just got finished going through the suspension on mine. Bottom line these trailer manufacturers build these trailers as cheaply as they can. I had a shackle fold up on me and found that all the shackles had been essentially tack welded. Also found they used plastic bushings. When I first got my trailer I was wearing out tires especially the right rear. Took it to a shop where they found the axles out of alignment. When you buy one insist on getting the dealer to do an alignment. I'd also have them install new bushings with greasable bolts.