Originally Posted by Tfryman
In the Garmin world you have the 770 LMT (Lifetime Map & Traffic) for about $400 or the 660 LMT which is an inch smaller (6" vs 7") but uses the same operating system and is $150 cheaper.
I have the Garmin 660 cuz I'm cheap and although it works as well as any of my other 3 Garmins in my cars, I have been underwhelmed with the RV specific features.
The 660 was never meant for use in an RV (I know: I had one on my Spyder...)
The 770 will allow you to tailor your route so that you avoid places where your rig will get squished...
However: the 660 is waterproof, so you can take it in the shower with you!