The AC and the furnace should be separate items, but may both be controlled by same thermostat. Probably need to go up on roof and take the plastic cover off the unit (should be easy, 4 screws at corners) and get info off a tag somewhere on the unit. You might take this time to check if everything looks ok visually and clean any debris out. Also check to see if fan spins freely. May also be some model info inside the plastic housing on the ceiling inside if you take it off. Usually, the hardest part of replacing an RV AC is getting it up on top and the old one off. But, check things out for problems on top before arbitrarily replacing it, only to find it still pops the breaker.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired