gmw photos wrote:
If a person wanted to know about how well diluted RV antifreeze resists freezing, doing a few simple tests with various mixes in the freezer in the kitchen would give you the facts.
Exactly!
I will share a tip, though. In MN in the dead of Winter, a full gallon will turn into a hard slush at ambient temperatures.
In the situation described, I'd suggest to use tank and pipe heaters so that draining the tank can be done at any time. If I was parked in NJ for the Winter, the under-trailer area would be enclosed, insulated, and heated. Sounds like a lot of work but 1 1/2" foam board used for skirting and a couple of heat lamps would do the job. That may keep your tank liquid but the drain pipe will need to be addressed so that the valve or pipe contents don't freeze.
There was/is a member here that parked his Arctic Fox in the Bakken, in ND. He had a setup similar to described above. He had temp probes on the axles to monitor temps. One problem he had was that he experienced a lot of weed and grass growth underneath the trailer. Not a terrible problem to have in Winter, in ND.