my 5th wheel is 13'4" actual measurement when hooked up to truck
7 yrs we traveled FT using secondary/back-roads rarely using any Interstates.
We came across several overpasses/bridges/railroad trestles that were too low but were clearly marked PRIOR so alt. routes could be used.
Only found a couple that were not clearly marked----just turned around and went another way.
Bigger issue was with CG entrances, CG roads and TREES \
That is where you REALLY have to pay attention.....look UP and if in doubt go about