I wouldn't go over 13'6"
and at that ht you will need to pay attention to all over passes, and also be mindful of things like paving etc that changes it even shorter
on our last trip (we do this 2 or 3 times a year) having anything over 13 feet would be a pain
keep it low and then when stopped you can go up 8 feet
google low bridges and see all the ones on the east coast, west coast not as much (and the 11ft8 bridge video is funnah
Interstate only would be okay, highway and back roads puts you into trouble
good luck and post pictures