For these, you may be responsible for the total amount unless you take collision insurance covering, for example, anything above the windshield or on the undercarriage. Again check with your automobile insurance company to check your current coverage. Dealers will charge you for tasks they have to perform. Treat the RV as if it were your home, and return it in clean condition. If you've rented a motorized RV, refill the gas tanks before returning it.
Some dealers asses a hefty surcharge per gallon.
While some dealers provide a free airport pick up, others charge for this service. Ask them what their charge is since it may be cheaper to take a taxi. Many independents don't provide one way rentals. Cruise America and American Safari offer one way drop offs for a fee between many rental locations by request. Some dealers provide livability packages.