rv cost per month
1 RV insurance premiums vary significantly; get quotes before buying a specific trailer. 2  Annual state registration fees can be $10-$50 for a simple tent trailer, to $1,000-$3,500 or more for a Class A motorhome. 3  Renting an RV storage space can cost $20-$100 a month outdoors and $45-$450 a month indoors. Lightweight trailers might slightly increase the fuel costs for the tow vehicle, while Class A motorhomes average 8-10 miles per gallon, with a typical Class A fuel tank holding 100-150 gallons. 2  At $2.50-$4 a gallon, filling the tank could cost $250-$600 to travel 800-1,500 miles.