The Pace Arrow did not use thermal circuit breakers in the DC path from the batteries to the distribution system. However, there will be two manual reset circuit breakers (inside the BCC box) between the batteries and the distribution panel.
The most likely cause of your problem, in my opinion, is faulty contacts inside the Aux/House battery disconnect solenoid.
The next time it fails, try toggling the Disconnect switch by the entry door (OFF then back ON).
'97 Bounder 34V, F53 7.5L-460