The only problem I have had with my basement AC's (other than a strange thermostat wiring issue with one that was preventing it from coming on at all) was loss of refrigerant. As we live in our coach, the AC's run ALOT!! I suspect that since the breaker trips, you have either a fan motor or the compressor motor failing. Try resetting the breaker, then check the voltage on L-1. Assuming it is 112 or higher, turn on just the fan for the AC that quit working. If the interior fan comes on, you know the problem is either the evaporator or the fan in the basement OR a short in the wiring. Turn on the other AC units so you can determine which one is the unit that you need to access. In many of the pre-1997 coaches, two AC units were stacked on top of each other in the front driver's side bay. If it is one of them, you can remove the retainer panels around the outside of the grills after opening the access door, then slide the units out as they are typically on a metal slide. Check the wiring to see if a critter has been snacking on the wiring (I do have a dead mouse inside the wire screen on one of my front two units but no wiring damage). See if the fan motor turns fairly freely. If not you fan motor is shot. If the wiring looks OK and the fan turns easily, disconnect the fan motor but leave the compressor still wired into the power. Turn the problem AC unit to cool and turn the thermostat down so it will come on after the couple of minute delay. If the compressor starts without tripping the breaker, you have isolated the issue to the fan. Although it is not easy to find parts to the Dometic basement AC's used in these coaches, folks have found sources during the past couple of years for the fan motors and for the compressors.
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