5% coupon applied at checkout Save 5% with coupon. Get it as soon as Fri, May 6. FREE Shipping by Amazon. More Buying Choices $92.02 All in One 12V Truck Heater, Parking Heater with Black LCD, Remote Control, Fast Heating Diesel Heater for RV Truck, Boat, Bus, Car Trailer, Motorhomes. 3.8 out of 5 stars 77.