The plumbing inside the heated area should be OK... But any cold water pipes exposed underneath the trailer may freeze... What's the wind chill with a 65 mph wind at 22 degrees? Any heat that was left in the water pipes will be gone shortly once you get up to highway speeds. May have a freezing problem, may not. Now you got me wondering....

The wind chill factor only applies to living creatures, not machinery and such. The wind chill will cool an item faster, but its lowest temperature will not fall below the ambient temperature.

Any water in your black or gray water tanks could be quickly frozen. Any pipes run between your flooring will be at risk. The interior temperatures will quickly cool to match the outside temps. A lot depends on how long your trip lasts and how cold it gets during your travels. With many variables present, it would be impossible to accurately time the exposure necessary, to effect a freezing condition inside your trailer.

A full water tank would take some time to freeze. If you anticipate extreme conditions, you could drain your waste tanks and complete a quick air purge that would ensure no damage en route. A few seconds operating your water pump, will quickly restore the water system.

Gard

Gard -

You mentioned some sort of adapter to assist with blowing out the water lines.  What is it called and where would I be able to buy it?

Thanks for all your good advice.

Here's a plastic one for $2

http://www.rvwholesalers.com/catalog/blow-out-plug-09-0215.html

Brass are available for $5

http://www.rvwholesalers.com/catalog/camco-brass-blow-out-plug-09-0214.html

BOL  Gard

You full tank of water , which is usually inside the trailer, Will probably be ok for two reason.  It will act as a greater heat sink.  Holding heat in the water. Also the water will be moving around int he tank as you drive. The sloshing will prevent it from freezing just like a running river doesn't freeze. It's the water thats not moving that will freeze first.  In a LQ trailer. that non-moving water will probably be the water in your pipes.  It will be under pressure and not moving in the pipes.  The pipes are often laid on the floor or against the outside wall of the trailer. hence they are not protected from the cold that radiates in through the wall or floor.

There is no formula that I can give you that says the pipes will be safe for X number of hours at X temperature.  It will be a matter of trail and error. Usually water freezing in PEX pipes won't damage the pipes. It's more the inconviences of not being able to use the plumbing when you arrive, until it thaws out.  I'd be more concerened about rigid items freezing. Water Heater, Water Pump than the plastic pipe. Buy a digital thermoter that records the high and lowest temps.  See just how cold your trailer really gets on a trip. If the trailer stays above freezing but the pipes freeze, Then you might try opening a cabinet door to let some heat into the area where the pipes are.

Perosnally, I just winterize the trailer and do with out indoor plumbing during the winter months. But then we have a week or two of 0* F around here.

On a side note Gard, wind chill will cause water to freeze faster, at least when it comes to my automatic waterer or even puddles in my yard.

The wind chill factor only applies to living creatures, not machinery and such. The wind chill will cool an item faster, but its lowest temperature will not fall below the ambient temperature.

A trailer moving in excess of 50 mph in freezing temperatures, will quickly cool down to the outside temperature. It doesn't have the thermo mass of a house,  the insulation "R" factor is less, aluminum and steel are excellent conductors of heat and cold, wood isn't, and a trailer is exposed to the elements on all six sides. Any direct comparison to a house would be unequal.

Gard