I owned the 7x29 Allsport model. 2008 to be exact.
Had twin 3,500lb axles under it.
I only put sleds in the trailer and all I could fit was 4 in there...so there is no way in my mind that I EVER overloaded this trailer given the trailer weighed in at 3,200lbs empty. That gave me a payload of somewhere around 3,500lbs. No way 4 sleds would get to that amount of weight...unless they were all Yamaha's or something...
I beleive the axle was put on the trailer incorrectly, or went bad during NORMAL use.
I think without the axle issue I would say these trailers are about a 7 out of 10 when it comes to build quality. Everything else on the trailer was fairly well built...still no Charmac or featherlite by any means...but respectively built. Throw in the axle issue and I have to rate mine at a 5 out of 10 because I had to replace tires like some larger women replace their Big Mac's.
Ryan