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The old VW bugs had that type of heat. I know I had one, it worked great.
He doesn't want to pump the exhaust into the camper just the heat. He said "shroud the exhaust", meaning pipe around pipe to collect the heat radiating off the exhaust and pump that in. Granted if the inner pipe sprung a leak into the hot air pipe he'd die in his sleep, but barring that it seems sound in theory.