WINTERIZE

Simply blow out the water lines, pour a bit of antifreeze in the traps. That should be fine for a few nights and take less than an hour of time.

Get a RV Blowout Plug.
It's quick and simple.

Ive camped in the low 20s without winterizing and had no issues. You should be fine.

If you can, run the heater at its minimum setting. Assuming you have a way to get power. I also camp in lower temps than you're expecting, and as long as I keep the heater at 55 degrees, and the days warm up a bit, all is well.

If you cannot let the heater run, I would not risk letting it sit with no heat.

Sealed underbelly? With your adequate batteries and a recharging method, run the heater at 52-54F. At those outside temperatures you should be fine.

Oh! And crack all cupboards open about an inch. All of them.

I've been in those temps when we had our travel trailers (Sunline, Winnebago Minnie) and never had a problem. I would open cabinet doors where I knew there were water lines running behind, near or in the cabinets and leave the furnace on overnight. In some cases, if it was getting below freezing for several hours, I would disconnect the fresh water hose.

If you're really nervous about it, just blowing out the water lines is very easy but you have to bypass your water heater unless you want to drain it....which wouldn't be necessary for a few hours of below freezing temps.

I can see it now. Hey, those guys on the internet said I did not have to winterize!!

Seems it depends on what the weather man is gonna send down the pike.

I think you will be OK if Murphy does not bite you know where.

Yea, if in 20's overnight, turn the heat on 50 or so. This past spring I camped in early April, and had a night that got to 25. The water hose and spigot froze overnight, enough that there was no water flow. If a 5/8" water hose can freeze that quickly, then a 1/2" pex line will freeze that much quicker if the trailer isnt kept above freezing.

I just got back a couple of weeks ago from the Sierra, and I had cold nights. First night was okay. Second night it got down to at least 17F. It was 28F inside the trailer when I awoke. I slept well, and was surprised when seeing the inside temp. There was ice in the toilet, and water was just a trickle from the faucets.

I kicked the heater on, opened sink base cabinets, and left the heater on 24/7 for the remaining 8 days. Set at the minimum it will go of 55F. Did not have any more issue, other than sleeping with the noise of the heater. I was boondocking. The tanks did not freeze as far as I know. Using onboard water and pump. Thank God for solar charging. She drank a lot of propane.

I felt that I had dodged a bullet that one night, that nothing broke or burst. Days got up into the high 50s or low 60s, which helps a bunch.