Cummin,
As a Canadian, you might not know that all the US Interstate highways have to have a vertical clearance for 14' (4.3m). There almost RVs that are taller.
Do read and pay attention to the other advice given here.
Matt
Matt & Mary Colie
A sailor, his bride and their black dogs (one dear dog is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.