Our bass club rents rooms often from motel/hotels that do not have outside access to 15/20 amp plugs. We have never had problems running 100 ft outdoor cords from first floor ( or second floor ) rooms, to charge our boat batteries. Inquire with the management about a feasible parking spot where you could run the cord to power your furnace, lights etc. sometimes they charge us $5.00 or so more, but it's worth the hassle. Some decent managers actually place cones in areas to designate our parking areas!
Dogs rule!
