I just bought a used Prindle and of course the trailer needed just about everything. Once I got the new lights on and new mast cradle and this and that, I went to tackle the wheels. Once i got the hubs off and took the bearings out it looked like the sahara desert inside the hub. Not really sure how it made the 30 min trip to my house. Point being that never trust the wheels to be OK. Always check them and rebuild if needed. After doing all the other work I almost decided to let the wheels go. I would not have made it 30 min down the road before disaster would have taken over. Its not a hard job if you have the right tools. You just have to be careful to put everything back together correctly. If not, grease will escape very quickly and you will burn out the wheel. I have seen burnt out trailer wheels where the heat melted the axle and the whole chabang went rolling off ahead of the car, Hub and all. As has been said already, bearing buddys are the best way to keep the grease in the hub as well as being able to tell if it needs more by the looking at the buddy itself.
Good Luck trailering.,.,.,.,}=)))*>