I just came through a few days of cold weather in my tintop/westie... The
wind howling, snow blowing at elevation, and cold rain elsewhere.  This
trip, I have along a Mr. Heater, a catalytic propane unit that uses those
small green propane  cylinders or  connects to a normal tank with a hose.
I can't believe I've camped and traveled for so long without any real
heat...
   The heater gets the van comfortable in a few minutes, it has two temp.
settings and a pilot light, a low O2 shutoff and a tip over switch.  I've
not timed how long the small cannisters will go.  Pretty compact when using
the small size propane, which tucks into the housing nicely.   These heat
soundlessly, almost..  fairly reasonable.... I gave $60 + 20 for the hose
to a bigger refillable tank.  Pretty cheesy construction, but it works
great ..and no more diving right into a sleeping bag as soon as dinner has
cooked, to keep from freezing...
    A thumbs up.
https://www.farmandfleet.com/products/395472-mr-heater-portable-buddy-propane-heater.html?feedsource=3&gclid=Cj0KEQiAsf_BBRDMpoOHw4aSq4QBEiQAPm7DL-2y2en3ABEpOhxnGay7WV5678qK_u51FhG-6Cy1HdcaArlf8P8HAQ

Sheesh, big link there.. sending by Android from the desert