We were using Google Maps with pretty good results, until one day last summer on a back highway in western Illinois. The friendly voice said "Turn left" and just before I made the turn, I looked down the road and saw a sign warning, 10'6" with arrows above and below the numbers. Glancing on down the road, I could see the railroad underpass.
Whoa! Now, our Vegas 25.2 measures 11'3" and I always allow an extra 3". Was able to avoid the turn and stay on the road we were on, but had we turned, we would have been unhooking our towed car to get turned around.
At our next stop, I ordered a Garmin RV 760LMT delivered to a friend where we could get it. I have a few issues with it but they might go away if I spent a little time with the manual! At least I know it won't direct me into a place my RV shouldn't be.
Bad decisions make great stories!