I don't understand changing oil at camp grounds to save a buck or two at all. For one thing, it's against all rules at any camp ground I've stayed at. And the same holds for doing it at the far side of a Walmart parking lot.
I understand the idea of doing it yourself gives one the satisfaction of "knowing" it's done right, and the idea it will save one a few bucks.
However, in this case, having either a Jiffy Lube type store, or a dealer do the deed will not cause massive failure in the engine. Also, if a $40/$50 oil change at a dealer or a $20/$25 oil change at a Jiffy Lube type store will break a travel budget, then maybe that trip shouldn't be undertaken in the first place.