Hemling,
A couple of solutions from most expensive to cheapest
1. Add a double mini split Air Conditioner and replace the existing roof top unit.
2. Add a 2nd roof top unit and an autoformer, combined with a hybrid inverter/charger that does load support.
3. add a window or through the wall air conditioner to the rear wall. Autoformer for sure--but maybe not hybrid inverter/charger
4. add a stand alone A.C. unit, one with twin tubes.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.