Instead of replacing the 50 amp auto reset breaker with the same thing, do what Lippert says to do, and replace it with an 80 amp auto reset breaker, and you likely will have no more problems. The hydraulic pump motor on these systems can draw over 70 amps, and the breaker can't handle that too long. You can install either a manual reset breaker or an auto reset one. I'm not sure whether you are losing power on the 120 volt side or the 12 volt side, but this solution is for the breaker issue you have had.
https://manuals.heartlandowners.org/...ippert0058.pdf