You'll get opinions both ways.
I use the switchover valve. You need to understand that you still have to check it or it's useless and you will end up at 2 in the morning with a chilly RV
and and if that happens you're going to have to wait till morning to get more propane
.
Some folks don't use it and only leave one tank on at a time. So when the RV runs out at 2 in the morning they can just get up, go out, and turn on the other tank
.
But if you do use it, and check it, no muss no fuss and no 2 in the morning issues
.