I still use my Garmin 1390 LMT (8+ years old), even when pulling the camper, but it is a small trailer.
I connect the Garmin to my laptop and let it do the free update, if one is available, before each trip. It also has a traffic radio in it, so it will alert me to any issues and also provide an alternate route if I accept it.
The DW will also put our destination into her "smart phone" and a couple of times I have used what the Garmin says over her phone app and have been better off for it..
YMMV, but I have no problems depending on my Garmin, that was less than $250 all those years ago.
-Brian
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2014 Bullet Premier 22RBPR - let the camping commence!
2013 F150 Platinum - 5.0 - 3.55 ELD + towing package
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