You mentioned that the camper battery was dead. That could be be the result of a pulled brake pin or something else. If the pin was pulled, the brakes activated and killed the battery. It most like damaged the battery so I would have it checked. It may take a charge and appear to be OK, but may not support a load like it did before. Any auto parts store can do a load test. If the brakes were on while driving, (pin pilled) I would also have them checked as they are likely damaged or need to be adjusted at a minimum. You can find replacement cables/ switches at most any RV dealer.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels