LF Bros
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.
LF Bros 110V/12V 5KW All-in-1 Diesel Heater, 5L Air Diesel Parking Space Heater with Plateau Mode, Come with Remote, T4 LCD Controller and Timer, Suitable for Home Shop Garage Camper (ASIN B0D66FZQ94). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0D66FZQ94).
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.