VEVOR
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.
VEVOR 8KW Diesel Heater, Parking Heater with Automatic Altitude Adjustment, Max 18045 ft, Bluetooth App Control Diesel Air Heater, Remote Control and LCD, for Car SUV Trailer Camper Van Boat Garage (ASIN B0CFQNR4SP). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0CFQNR4SP).
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.