Jason, check with Larry at roadhaus.com re the heater he has. We met him here in Anchorage, AK yesterday and he has a neat looking unit mounted under the rear seat of his 91 Westy Syncro that he said will keep the interior temp in the 60's when it is 15 outside(with the top down). With the top up you would lose more heat of course, but 60+ is pretty good when it is 15 outside. His unit was small enough to allow plenty of storage still, for those times when you do not need the heater. He also has an auxiliary propane tank under the sliding door, which would be a good idea for someone running a heater as our tanks our rather small.

Mark
mst@ak.net