While I haven't sprung for the "Trucker/RV" Garmin I have used Garmin products for years. Started with the one that had a hard drive inside. I have a friend with a Lexus whose built in unit stopped giving directions about 3 blocks from our destination in a small town in NC.
Another friend bought a Tom-Tom and literally threw it out the window when it said "no further directions available".
I also noticed that lots of the private planes use Garmin GPS and some other Garmin brand electronic equipment.
Garmin for me all the way
. But, be sure to update the maps every couple of years.
Life is a journey, not a destination.
2005 Georgetown 359ts
Bill & Virginia, Kentucky
Nights camped in 2011...78 , 2012...73,
Nights camped in 2013...123, 2014 ...101