You need a heater while trekking through colder/high altitude areas unless you own 435 blankets.
A HS2800 Propex heater has been installed in Big Bertha since her inception.
It works alright but doesn’t compare to the specs for Espar & Webasto.
If you’ve got the change, spend for the Espar.
If you want to save a few shillings, go with Webasto.
If you owe money like Pookie owes us then get the Chinese heater.
Propane heaters should be your super super last resort because refilling these tanks are not as convenient as gas/diesel.
Yes, even if you’re running a propane stove I wouldn’t do it (VV learned this the hard way).