Originally Posted by Airstream330
I don't have enough experience to say for sure but if we hit a patch of weather that is around freezing and we are traveling at 60 MPH I'd say things could easily freeze and one extra day without plumbing is a lot less inconvenience than cracked lines.
Traveling at 60mph makes no difference. Your Airstream is only affected by wind chill if you leave the furnace on, and only to the extent that you'll use more propane. Wind chill only affects objects that produce their own heat, and only to the extent makes those objects lose heat faster.
For illustration purposes, let's consult NOAA's "New" Wind Chill Chart (there's also an "old" wind chill chart that uses a different formula and produces colder wind chills). Wind Chill Chart
At 45°F and 60mph, the new wind chill number is 25°F. Despite a sub-freezing wind chill, the actual temperature would still be above freezing. Your pipes would not
freeze under those conditions, even if the furnace was turned off. However, if your furnace was turned on, it would use propane as if the outside temperature was 25°F due to more rapid heat loss caused by the wind.