Those breaker at the campsites get turned off and on so many times by us campers, they eventually have to be replaced. They are mechanical so, flipping them off and on enough will wear them out and make them more prone to tripping. Also, heat will trip a (weak/worn) breaker more quickly. You may see that more in the high temp areas we camp in.
Not applicable to us as campers but, under extreme conditions (lab tests I've participated in), we could watch a brand new breaker under a mild load trip when applying an open flame (torch) to it. Fun times when that is/was your line of work.
"Stateboy" (Formerly "36fire412")
SW Lower Michigan
2012 Toyota Tundra Crewmax TRD 4x4