I would find a replacement main breaker and try that for results.
12 amps seems low to me for AC use, especially if you have 2.
Also, check when power is off to see if you have any power to the main breaker, but none out...
If the main breaker doesn't have power, it is something between the pedestal and the breaker--the surge protector/power managementsystem?
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