Sokaiso
A diesel heater burns fuel from a small tank to heat a cabin, van or tent space without using the engine. If you only camp in mild weather or already have a heater, you may not need one.
Van, truck-camper and cold-weather campers.
8KW Diesel Heater, 12V/24V Parking Heater with App Control and LCD Display, Automatic Start and Stop, for RV Garage Camper Fishing SUV Car Trailer Camper Van Boat (Red - Horizontal) (ASIN B0FKZ2J57H). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0FKZ2J57H).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.