I use a "TomTom"
It was the first TomTom ever to be available
The one prior to TomTom-One

20 years old !
Still going strong
(bought with Data-level 18 and actually updated to data-level 981)
Runs great on 6 volt, but doesnt fill its battery.
To find tiny roads while going distance over here, i use a "Tripy2"
I guess this aint availlable in US.
Tripy2 was made for dessert-rallies on motorbikes and goes
14 hours on own batteries
I even manage to fill the battery of my smartphone in the A.
As so, any Smart-Navigation should work there
(but i never tried).
Have fun Christoph
BTW
Might be interesting to know, which one you tried without success.