TV battery life? And Interstate longeivity? Diesel trucks.

Winter isn't hard on them, the heat is. It's just winter when their diminished capacity shows up.
That being said, in 40+ years of driving I have had a battery short internally on two occasions.
When that happens you cannot jump start. You have to replace the batterys before mvoig on. So to keep from getting my family stuck in the middle of nowhere, I replace them every 5~6 years.