I would budget at least $400 per month with the understanding that some months may be much higher. Some months we have spent as much as $900 for the month (not a monthly rate), but other months we have spent as little as $100. The great thing about full timing is if you start going over budget all you have to do is stop moving for a while. Campground fees and Fuel budgets go hand and hand as a full timer. Campground fees and fuel budgets can both be brought back in line by sitting for a little while.