[Rich Biebel]

The tire would show some sort of abnormal wear if the axle was out of alignment. If the tire is wearing the tread fairly even and not featheredged across the tread it's good. Trailer loading definitely might be a factor. More weight on one wheel is possible....

The type and quality of grease made a huge difference for me years ago on a trailer I had. It was eating bearings and only had 3500lb axles on a 22' box trailer. It would routinely trash a bearing and I was not towing long distances. It got to the point that every trip I made to the track I jacked the trailer up with car unloaded to feel the bearings. I carried complete new sets with seals.

I started using synthetic waterproof grease and never had a failure again.
That was a fairly new product at the time and was far better than the usual stuff.

My present trailer has Nev-r-lube sealed bearing cartridges......I've replaced them once for no other reason than I felt better with new. I kept the old ones for spares......

Blown tires and burned up bearings on the road makes for a rough trip.....been there....