That old milk house heater? It's huge and noisy. That duel element HOLMES "ceramic" heater? They won't� put out enough heat.�And almost all ceramic heaters you see have small ceramic elements with aluminum baffles that conduct the heat--so it is really like the old milk house heater.�I have both of them.
�And they are not required to shut off if tipped. I know the holmes doesn't.
Get a real ceramic heater; Pelonis Ceramic disc heater. Has a special thermostat so it runs steady and you can adjust the speed.� I have the older model that is 6"x6"! �Very small but puts out all the heat you can stand, or turn it down to what you need. It does shut off if tipped.� I've had a few heaters like this and the Pelonis is by far the best for use in a Vanagon.
The price is about $50 delivered.� Ebay--big box stores do not sell them.
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Chris C 
90 mv