Yes that's a perfect use.
There are a couple of ways to wire this:
In the case of a small RV you would probably put it on the entire output of the battery, since its 65 amp rating would most likely be more than you need. You should still protect it with a fuse or circuit breaker.
When using it on boats you would probably only wire it to non-essential circuits like the refrigerator. You don't want your essential circuits like the bilge pump to get cut off in the event of a low battery, you still might need them, low battery or not.