last year we spent over $15,000 on our 2004 DP. New tires, new AC, radiator repair, service on refrigerator, Hydro Hot, generator, oil changes. Some years we only have to pay maintenance service. $300 oil change, $200 refrigerator service, $200 Hydro Hot service. DH used to do the service but had heart surgery a year ago and now we pay someone to do it. Fuel is cheap now but double that in case the prices go back up. We average 8-8.5mpg. In 2015 we averaged $439 per month in fuel for 4 months. (didn't travel as much due to heart surgery). In 2014, we averaged $688 per month for 9 months of travel. (trip out west). For campgrounds we average $25-$35 per night. In popular tourist areas in season that could easily double. Insurance will depend on your driving record and the state of residence. Since we're in Florida our insurance is expensive. Too many factors to give you an estimate.