Yes, most RV GPS units allow you to put in the rig height.
But remember, the GPS data is only as good as the data from the highway departments, and clearance never considers the entry/ exit road height changes which can make the roof of the rig higher than the level ride height.
I would personally be concerned about any bridge I approach which is listed as less than 1 foot of clearance for my rig.
In some states, Florida and the northeast mainly - 13'6" is over the legal limit. You won't get a ticket for an inch, but don't try to complain if you hit a bridge or traffic light.