I just helped my kids fit one in their Base Station.
EBay, about $180. Very comprehensive bit of kit.
I wasn’t impressed with the mount plate/heat transfer to the van’s floor so we mounted it with a piece of fibre cement board as an insulator. Worked well.
Check underneath for services etc before deciding on the position.
The unit is very quiet, inside and outside the van.
Only noise is the fuel pump which clicks at each stroke, wouldn’t worry most owners but something to consider when mounting and positioning the pump.
Uses bugger all fuel. We mounted the diesel tank (10L) on the drawbar behind the gas bottles. Easy to fill when filling the car.
Exhaust smokes on start up but within a minute it’s dead clean with no fume smell. Depending on your mount spot, you might need extra flexible exhaust ducting to exit it in a happier position.
There’s also the burner’s air inlet to consider. Probably not a good plan to draw from near the tyres.
Has a nifty wired control which tells what’s happening temperature wise.
There’s also a remote for when you’re in bed. Handy to alter the fan speed which will obviously alter the temp.
It was so efficient I turned it off after 30 minutes, van was toasty.