Breaker tripping every time I reset it
If the circuit breaker trips every time you reset it, then first: stop resetting it! There's almost certainly some sort of overload or short on the circuit, and the breaker is saving your trailer from a fire. If you try hard enough you may convince the breaker to stay on; your reward would be some very cool fireworks and a perhaps-denied insurance claim.

Your next job is to figure out what's tripping the breaker. Unplug or turn off everything on the circuit and try again (once). If the breaker still trips, then you probably have some sort of fault in your wiring.