In the end one critical issue will be how long you camp at one site.
Until this last year I've been spending the winters camping in Mexico, way, way off-grid, for 3 months at a time. I have a 1982 Vanagon camper, and I tend to stay at one place for a week or more at a time (gas is more expensive in Mexico than California!), I don't do a lot of running around once I'm camped. For most of that I had 200 watts of solar and a 150 amp hour battery. My loads were a small 12 volt Danfoss compressor fridge that uses 24 watts when it's running, LED lights and a laptop at night, not a lot else. Even in sunny Mexico I found that there were many times where after several days in a camp site my battery would be getting low, a couple of cloudy days can really sap your reserves. If I drove an hour or two to another site the battery would recharge and I'd be good to start over, but if I was staying in one place it would be an issue.
Last year I upgraded the battery to 280 amp hours and put two more panels on for 400w of solar. I feel comfortable that would handle my needds, but unfortunately haven't had a chance to try it out.
Just saying, don't forget to plan for a couple of days of overcast weather, unless you're driving every day or two. You always need more panels than you think you do, and they're dirt cheap at the moment.