Wondering if anyone has taken their cats in a trailer? It would seem that they would certainly need to be in a carrier, tied down so that it doesn't slide around. What about temperature? My trailer...
If you are ever in an accident, that trailer will disintegrate on impact. They do not hold up well at all. No RV does. There is much more protection from harm in the truck with you as well as heat or air whichever is needed. There are different types of carriers, maybe another type would work better for in the truck.