Trailers = Unlimited Mileage. Motorhomes = Each night you rent includes 125 free miles of travel on most motorhomes (Diesel Pushers come with 225 miles per day). So for instance if were renting for 3 nights, you would have 375 free miles of travel included with your rental. We calculate your mileage from our storage lot to your destination and back to the lot. An Example: Based on a trip to the Grand Canyon from our location the round-trip travel mileage is 812. Based on this scenario, the additional mileage is 437 miles @ 32 cents per mile or $ 139.84 additional cost