I have no idea who (or where) made the races in my disc brake rotors but put Timken Cones (USA made) in. At ~3000 miles this past spring, everything looked like new. After another 3000 or so miles this year will be checking them again in the spring.
Timkens seem to be the favorite for RV but others lke Fafnir, SKF, Bower and so on are also available, using the standard bearing designations. My history with the Dexter OEM is not good. At ~ 3500 miles after buying the RV new found one that was chipped, another with a circumferential gouge around the rollers and a 3rd that was turning blue. Dexter - you did me wrong as I suspect that 2 of these these were your problems caused by slipshod assemblers, not the Chinese bearing manufacturer. In addition, I replaced axles on the last 5er - and four out of the 8 brake shoes were contaminated by grease as they came from Dexter.
Traveling with my DW Susan, a couple poodlepups and our 2014 Montana High Country 343RL, being towed by a 6.7 2011 F250 CCLB using a B&W hitch and OEM puck system