I've used my TT in cold weather, numerous times. Here are some of the challenges I've experienced:
1. Finding a dump station can be difficult. I've been in campgrounds that will only provide electric. No running water and no dumping.
2. I have electric tank and pipe heaters installed to within 10 inches of the dump valve. High winds and very cold temps, that wasn't good enough to protect the valve itself. Now, I carry plenty of disposable pocket warmers. When I leave the campground, I remove the cap on dump valve and put in a couple warmers . Then replace the cap. They keep the valve thawed until I can get to the dump station. Don't dump the warmers in the sewer.
3. Had an ice storm that killed shore power in the campground. I had enough pink stuff to winterize right away.
4. I've had ice build up on television antenna. Had to get up on the roof and thaw it out to bring it down storage position.
5. I've had the propane regulator freeze up. Plenty of gas in the bottles, couldn't get any out.
Disposable pocket warmers, RV antifreeze, ladder, and a 12 volt hair dryer come in real handy.