Anthony,
You stated you want all in one. They may be expensive. I have been looking into that and currently find the dash mounted GPS are great for cars but automatically including low underpasses does not seem to be there. With that thought your "don't want to" comment is something you might have to change. I plan my trip on the laptop using an additional inserted list of low bridges. Then I put the way points in the truck gps and it tells me where to go.
Good luck on finding an vehicle mounted unit that does it all and please let us know if you do find one.
With that thought I always take the truck routes in towns. Returning to Rochester, NY I was on East bound Route 20 in Western NY and followed the truck route. When I got back on the main route I noticed the West bound lane had a sign saying low 11' underpass. Got lucky on that one.
Good luck and safe towing.
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