I looked at the Rand McNally unit and passed.
I ultimately purchased a Garmin RV 760LMT (Lifetime Maps & Traffic)
Garmin RV 760LMTWow, was I surprised at what a inferior product the Garmin actually proved out to be. The first unit I had - the screen locked up! I also found their "software suite" cumbersome. It requires you to download 3 different files for 3 different programs to update and trip plan on the unit!
Disappointed with the freezing screen of Garmin, while I waited for a replacement I purchased a TomTom VIA 1605M (Lifetime Maps and Traffic (Traffic requires the purchase of a "radio enabled" car charger)
TomTom VIA 1605M I've had the opportunity to run each unit, side by side in comparison and I found that the Garmin missed my height requirement for my RV more than twice (not something that you want to find out at the last minute!!!) Scary! I was in my truck, running both in identical "RV Modes" too! TomTom allows you to program for up to 5 different types of RV's, which is nice. Not so on the Garmin.
The TomTom has something called "GPS QuickFix" and Map Share Technology. The QuickFix file (which can be downloaded on a daily basis if you choose to) tells your GPS where to look for the satellites or where to get a "fix" on as many as possible.
The MapShare is the beauty of TomTom. It allows customers to submit map changes to TomTom (using the interface on the actual unit). Once verified by TomTom, you can download this file (usually on a once a week basis) Trust me when I tell you that this is the present and future of GPS units. Why should you have to wait 3 months to get an update to a map with ever changing roads (detours, temporary closings, etc) when you can get map updates every week PLUS the 4 times a year map updates!!
So, for almost $200.00 less ($399.99 for the Garmin and $206.95 for the TomTom) I much prefer the TomTom for it's ease of use, the Live Traffic, the GPS QuickFix and the MapShare abilities.
Here is a nice holder for the TomTom:
Universal Dashboard MountThat's my 2 cents,
WoodGlue