I like a Garmin for driving near cities with heavy traffic. They have the best most current traffic info IMHO.
I use a Rand McNally RV GPS for towing. I like the interface and the way POIs like campgrounds are laid out and searchable. I don't like Garmin's campgrounds search info.
My best RV buddy likes a Magellan RV GPS to use with his 40 ft motorhome - I can't stand the interface of that GPS.
Many people swear by apps like CoPilot and Google Maps on their phone or tablet. I've had to change route information in areas with absolutely no cell phone service to be comfortable with those.
No matter which you choose a few pointers:
1) Use the Fastest Route method. Never use Shortest Route for an RV - it will direct you down dirt farm paths.
2) Never completely trust any GPS to give you perfect directions. Know the roads/ route you plan to travel, know how to use a map, and remember driving is your responsiblity, not the GPS. If it wants you to go down a questionable road, DON'T. Pull over and check a map.
3) Most RV GPS have a height/ length/ weight capability to define your RV. Use it. However, pay attention, and if you see a sign saying a bridge is low for your height, or a weight restriction under your total weight, or a prohibition for your length - STOP and check.
Know exactly how tall your rig is - MEASURE it - don't use the brochure. Know how long your total hooked up length is - MEASURE it. Know how much your rig weight - there are CAT Scales at truck stops everywhere that don't cost much.
Again NEVER EVER TRUST a GPS to be perfect.
They are great tools, and like any tool you must learn to use it. Pick a route and run that route several time withs different options selected. Learn the strengths and weaknesses of the model you choose.
I am towing tomorrow from Fairfield, CA to Red Bluff, CA - a pretty straight run a few miles over to I-80, a couple miles to I-505, and a straight north run to where I-505 merges with I-5. I am programming the GPS tonight with a couple waypoints to make sure it follows the route the way I want to drive.
Full-Time 2014 - ????
โNot all who wander are lost.โ
"You were supposed to turn back at the last street."
2012 Ram 2500 Mega Cab
2014 Flagstaff 832IKBS TT