Navigating low clearances/city roads

We recently completed our annual Spring Break camping trip, this year however with a much larger RV in tow. We bought our 5er before Christmas and this was the first tow to somewhere we have never driven before. We didn't have any issues towing in high winds, traffic etc., but I did run into some issues in/around dallas, Tx with a few very low bridges. We measured 14'2" to the top of the A/C unit the highest point. The last bridge we came across was a mere 14' even. So we obviously had to navigate around on the fly in a busy area.

My question....is there a navigating system you guys use to help with this issue? Our coach can't be the tallest RV on the road...

I have read reviews on the Rand McNally, and Garmin Rv Nav units with very mixed reviews, just don't want to spend the 400$ and run into the same issues as we had before. Just looking to lower the stress levels a bit.

THanks in advance.