What "camper breaker" tripped? One exclusively for the fridge, or the main (30A or 50A), or something else? Breakers trip when too much power (amps) is demanded, but the fridge may share that breaker with other appliances or outlets. Many Rvs have only limited power available, e.g. a max of 30A. You may not be able to run everything you are accustomed to using at once.
And what make & model of fridge are we talking about? Most of them will automatically switch to LP (propane) if no 120vac power is present. Beeping indicates some sort of problem, but just what a beep means depends on the specific fridge make & model.