I'd vote for a more portable option. Ever since I made this for about $85, I've lost all desire for a vehicle mounted system.
Pack it empty, dunk it in a stream, heat it on a fire or a burner and wander off to a nice private spot without creating mud at your feet where you step into your truck.
I often camp near water and enjoy stoking a fire, and in this case, unlimited hot water is usually on tap. Really nice for washing dishes, dogs, gear and people.
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View attachment 308273