Where a lot of people seem to get into problems is when the trailer has little cargo capacity---meaning the empty weight is close to the axle capacity. Then when you put anything in it, the axles are overloaded. So look for a trailer with a much larger cargo capacity than you think you might need, which translates to a dry weight much lower than the GVWR.
Most trailer tires are not the best quality, although a few brands are OK. If you keep them properly inflated, you should get a couple of years service out of the ones that come on the trailer. At that point, you want to go with a better trailer tire brand, or move to a light truck tire, and possibly a bigger rim.
Bushings wear out, that's the nature of a trailer axle.
Some people do an axle flip, to get more ground clearance.