Jumping The Rails...
Neighbor and friend was an LPG tech for a large distributor. Got onto a discussion about keeping the cab warm on sub zero nights at 7,000 ft.
Turn out he had an older underhood LPG heater. Heater hose passed through it. But it needed more circulation and it needed a way to blow heat off the pickup's heater core.
I found a tiny but expensive pump at WW Grainger and I had one of the old BW Magntatek 775-2 75 amp chargers.
I installed a **** valve bypass, and set the heater as low as I could. The pump was 12 volt.
I set a 125lb horizontal tank in the bed then ran pipe and motor fuel hose to the heater. I replaced the old original heater blower fan. The heater operated by a pilot light.
NIGHT ONE, Set the heat at 1 the lowest on the dial. Connected the charger and flipped a new bypass toggle switch that fed the under dash resistor on it lowest setting.
The temp dropped into sub zero that night.
Next morning I found the cab to be around 40F.
The heater was circulating through the engine!
Turned the dial up to 2
Next morning found the cab around 55F
Set on 3 and it snowed that night. Next morning the windshield was dry and when I switched the cockvalve setting I had almost instant cab heat.
Really made a difference in comfort.
Reality reared up. Let's avoid the subject of propane usage.
The night it dropped to -39F in Bridgeport I used the heater.
I believe it was around that time I abandoned ship. One day I decided to drive to the LA area to search for alternator cores to rebuild. It was 5F when I departed. When I got to Ontario the new-to-me Santa Ana winds were howling. 83F I don't do cold too good...