DO NOT use Mr. Buddy or any other propane heater in a closed vehicle. I had two friends die doing this in the back of an enclosed trailer. The CO2 build up will put you in a sleep you will never wake up from.

Beanie & a fleece gaitor ! And have a very good plan for doing #1 , thongs, sandals , or standing on steps, skids !

Were they using the "right" models?

I don't suggest it either, but *supposedly* some are safe for enclosed areas.

Lots of great recommendations in here. When I started camping in the T4R I wanted a way to block out light from windows and came across this company: Window Covers: Toyota 4runner 5th Gen. 2010-Current – Strawfoot Handmade

I bought a full set and love them. Blocks out the light and it was nice and warm in the truck due to the window insulation. There is a great review of these here: Trail Impressions: Strawfoot Handmade Window Covers - Trail4R.com

Pricey, but if your ever stealth camping in a neighborhood/city with street lights beaming in the windows it really makes a difference. I've got pics from my build log here: https://www.toyota-4runner.org/3572104-post26.html

Wow! Dude! I LIKE those!
Where were they 8-14 years ago!?!

Wow. Thanks for that info.They look great and elegant. Very tempting. But $800 +tax for a full set, ouch. I’m considering making a set from a roll of that aluminum foil bubble insulation from HD.

Ditto... Scissors and $30 will net a whole set for the entire vehicle. I made my own and use suction cups to hold them against the glass. Not worth $800...

I see what you did there.

I couldn't be happier with them!!

They're located in Santa Cruz, email the company and see if you can do a local pickup deal to save some money like I did.

No doubt that aluminum foil bubble will work, but I tell you what: the magnets and insulation in the strawfoot covers make a big difference. Takes all of 3 minutes to snap*snap*snap them onto the windows and they stay put. The addition of the window flap so you can have a window cracked and allow airflow is also a nice feature. Not saying you can't accomplish this using the bubble foil, this user seems to have done a great job (see last picture in this post): https://www.toyota-4runner.org/3581059-post14.html

To each their own of course. And yes, you are correct that they don't currently make a windshield cover. We used a standard cover at the time but now I use a CoverCraft windshield cover which works great: 404 | CarCoverUSA

an idea: make a 4Runner winter skirt? especially if you have sliders and front/rear bumpers with recovery/shackle loops for attaching it around all sides i could see this being pretty easy to setup and worth the time for those consistently using the 4R for sleeping in the cold.

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In addition to all of the above get a couple of the Zippo hand warmers. One in the bottom of your bag by your feet and another in a pocket somewhere will make allll the difference. Don’t buy their little containers of fluid either, go to REI or Walmart etc and grab some generic camping fuel- for 2 or 3 bucks more you can get a huge can!