We manage very well to Off the Grid Boondock at high elevations and cold / freezing temperatures. At elevation July and August... snow, sleet and freezing temperatures in the Rocky Mountains. Yes... ask the 2016 Wyoming Adventure Survivors.
(1) An Airstream is like sleeping under a sheet in a snow storm in a Tent.
(2) Tent camping using sleeping bags and two Blue Heelers is like an Airstream with propane furnace, sleeping bags and frost within the trailer.
(3) A WINTER Travel Trailer is best if UNDER 25 feet long, prefer two 30 pound propane tanks, orientated trailer side towards Sunrise for AM interior heat and exterior heating.
(4) Longer Airstream... 25 foot is manageable. Once at 27 to 34 feet, wait until the lows are above 30 degrees, works.
We found our 23 foot 2006 Safari comfortable and easy to maintain a comfort level, within a range to conserve propane and not suffer the negative effects of freezing water tanks, lines and grey / black water tanks. This Safari had the 'white mouse fur' interior which did help.
Our 2016 25 foot International was marginal, but could be managed if the furnace was set at 55F. It ran often. The inner skin was cold to the touch. Two 30 pound propane tanks are advised and carefully observed as to one tank being empty and switching automatically to the other.
Scroll to 2022 when I found a 2019 Oliver Elite II, finally. I wanted 2019 to be compared to the 2019 Airstream with appliances and technology available at that time.
The Oliver... is compared to our 23 foot Safari as to length and interior. The Safari is has a bit more interior and is slightly longer shell.
The Oliver was EXCEPTIONAL AT SPRING COLD EVENINGS and EXCEPTIONAL TO WARM THE INTERIOR AFTER SUNRISE.
We spent ten days in the mountains of central New Mexico early April. Morning temperature before Sunrise was 11F to 18F. Dog's water bowel frozen to the bottom. No frost as the humidity is under 8% at best. We had multiple covers which Nancy used. She is... cold blooded. I am hot blooded... and shed covers like a dog sheds hair. The Oliver has twin beds. The pup Heeler curls up with Nancy as a joint heating project.
Higher humidity... venting, venting and venting.
The Safari 23 foot was between a Twin and a Double bed. I furnish the heat for Nancy.
We used 3.68 gallons of propane in 10 days from a full 7 gallon tank. Furnace set at 55F, but may have cycled three times an evening. The design of the Oliver protects all water lines and water tanks. Under the curb side bed is all of the water system for the interior. The water tank is above the frame and within the shell area, from what I could tell. Water faucet flowed with room temperatures.
Olivers ARE, in my opinion at the moment... THE BEST WINTER CAMPING TRAILER AND THE 23 FOOT SAFARI IS SECOND. Our 27 foot... would require a lot more Propane under the conditions we camped this month in New Mexico.
Furnace is partially responsible for comfort in the AM. Solar is instantly hot once the Sun rises... hard to explain... but talk to Skiers at 12,000 feet in tee shirts. We have stripped down to cool off at Keystone Ski Area in Colorado in Winter.
We orientate the door side of the trailer at SUNRISE. At elevation, low humidity and thin air... the SUN is HOT. We open the door, screen door open or closed, open windows on the Sunny side and FREE HEAT.
This, of course is a simplified description of how we manage cold and sub freezing Off the Grid Boondocking with NO Hookups... but SOLAR IS 100% REQUIRED.
I include photos:
First: June 2006 7100 feet elevation Wyoming.
Second: May 2009 New Mexico central mountains 6700 feet elevation.
Third: April 2022 Western Wyoming, 7000 feet elevation.
Fourth: May 2020 Oregon Buttes, Wyoming 6800 feet elevation.
(photos not in order, but what the Hell... but close enough.)
We were warm. Comfortable and neither of us had a complaint. It was our FIRST trip to check out the Oliver Elite II. We will be leaving again soon at Elevation. Ahhhh....
I rate the Oliver Elite II at 100%.
I rate the 23 foot Safari at 85%
I rate the 27 foot International at 70%.
I rate our insulated mountain tent at 30%.
To maintain comfort the Oliver uses the least propane. Of course, the longer the trailer, the more propane needed. When I filled the Propane Tank on the Oliver I have the receipt, so know exactly how much was used. This includes the Propane Norcold Refer... a wonderful refrigerator compared to the Dometic. Cooking on propane. Did not take a hot shower.
My opinion... of course and sticking to it.