FYI Axel Failure

I can totally sympathize with the OP. Our TT is a Forest River product, and has Lippert axles and slideout mechanism. Haven't had any trouble with the slideout in the 6 seasons we've owned the trailer, but the wheels, hubs and axles have been the bane of our existence. Granted, we have put a lot of miles on the trailer, but on a recent, relatively short vacation (900 miles and 7 days total), we discovered grease leaking out around the grease cap on one wheel (again?!?!) when pulling into our first CG, 80 miles from home. The mobile mechanic the CG recommended (who, it seems, did an excellent job repacking bearings on two wheels) told us several times that he sees this problem a lot - and the main reason, he feels, is that bearing jobs are considered to be "grunt work" and many, if not most, RV repair shops let the least experienced guy do them. As a result, hubs might be too tight or too loose, bearings not changed when they should have been, the wrong kind/amount of grease applied, etc. I think this happened to us, though the first hub blowout we had, when the TT was only a year old, may be a result of original equipment failure or improper bearing job done at the factory. We'll never know. We have had one axle replaced and one spindle on the other one replaced. This last time, the problem hub had been put on too tight, and its companion (opposite side of the trailer) too loose, causing uneven tire wear. Needless to say, we are pretty gunshy about trailer wheels now.