Pulled the big trailer into the pole barn to do some maintenance on it.
After soaking all the studs and nuts with penetrating oil for a week while I finished another project, I tried to get the nuts off! Whew! Finally put a little heat to them and they begrudgingly squealed free! Pulled the first wheel off to look inside. Cobwebs and dirt! Inside of hub doesn’t look like brakes (at least this one) really were doing all that much. Will clean it up, pack the bearings, and put it back together. Was able to find the inside seal size, so can order 4 new ones.