Campfires and RVing pretty much go hand in hand. In the past, RVers have hauled firewood with them to use while camping without any issues. In the past few years, more and more campgrounds have banned the transportation of firewood into their park to help stop the spread of the Emerald Ash Borer as well as other tree destroying insects and diseases.
Before loading up any firewood, please call your destination campground to see what their current rules are on the transportation of firewood. Many campgrounds have firewood for sale in the office or might have an approved seller in town.