Those breakers are most common with a heavy slide, or heavy lift, such as FW landing gear, or TT with heavy tongue wt/electric jack. In many cases, they are only 3' from battery pos post, but just on inside wall of pass through.
Grit dog...your TH with heavy tongue, may have a similar breaker for the jack, and a second one for a large slide, if you have one. That saying..."old dogs can't learn new tricks" is not true.
If OP had mentioned right away, about the intermittent slide operation, that gives a strong hint of a faulty/dying resetting breaker.
Jerry