seems nothing is made to be rebuilt or even simple preventive mtce but only to be replaced. all bearings should be sealed to keep it full of grease not necessarily to keep water out.
besides 'pros' only want to fix fast and really do not care like the diy owner will, besides you might even think of way to improve something if diy.
those look essentially open bearings, same as mine i think, i spray with silicon spray, did not have spray grease, so why not some nice spray grease that then solidifies some to stay inside the bearings whineyBagels/kwikee/hwh ??? huh huh huh ?
OR did you not make your rv's to last for mo than 5 yr use ?????
ps: i remember seeing CEO of GM, robert stempel iirc, and he said that they actually designed all the parts to last the warranty period only, which at time was a lame a$$ 12mo/12k miles, but yet we see constantly how 'great' vehicles are, so if so great put a 10-15yr/100k mi warranty ?????!!!!
yep that is what I thought, few would make it !!