If I am on the move , I just pull into a place that fills propane. Often they call fill it on the TT, just like a motorhome with built in tanks.
If I am stationary, and it is a cold weather trip, I bring extra tanks.
I just returned from the Utah mountains. 2 weeks with temps into the single digits. I brought 5 extra propane tanks, and still had to make a run into town to refill them.
Also, when stationary, I will use some 20# tanks. I just set them in the tray and hook them up. The advantage is that sometimes the closest propane is an exchange seller.