"4 years full timing never looked at my bearings. I use AMZ/OIL Synthetic Grease. It flows easily, with the cap removed I have tire off the ground and keep on pumping while rotating the tire un til mostly red grease appears. All the while I wipe off the old grease coming out. I grab the tires at each edge and give a push pull test."
Smart man, also using rig full time is better for bearings/tires than the seldom use, that so many rigs get. Yes, doing a wiggle test, tire off the ground, tells a lot. Oil bath, and disc brakes...can't get much better than that.
Jerry