We started off with Tom-Tom's and, at first, they were great but the last one we bought had serious issues and almost zero tech-support so we bought a Garmin and LOVE it! It has free lifetime map upgrades, too. (It's a 5-inch, model 52LM)
There's also a Garmin friction mount available which is great because you can grab the entire thing and move it from vehicle to vehicle or store it inside something when you stop. (I've known people who've had their windows smashed and one thing they took was the GPS.)
But now we have GPS in my new Tundra so I'm not sure if I'll even use my Garmin now.
Rick & Karen
(Retired USAF, MSgt)
5-year Travel Trailer RVers
2013 Forest River Rockwood Ultra-Lite 2904SS
2014 Toyota Tundra Maxcrew SR-5 TRD 4x4