My favorite heater for drying my stuff was an electric plug in with a built in thermostat.
At the end of my sled day I would load the sleds, hang up my long underwear, pull out the liners on my boots, hang up jackets, bibs and my toasty comfy socks on wire racking I got from home depot.
I had my driving comfy stuff to change into of course.
When I got home, I would back the trailer into its spot and plug in the heater. By the time the next weekend rolled around, I unplugged, hooked up and off I went. No big bags, no back packs, checking if everything was packed etc. because it was all dry and in the trailer.
I didn't have to wash clothes every time cuz I would only wear the clothes for maybe 6-7hrs max and it was good quality stuff so not a lot of sweating.
I don't know if it would work in a really cloud climate as it rarely froze in the winter near the ocean.
So convenient, so easy. So sad I have no enclosed trailer now.