Wow, talk about dredging up golden oldies! (15 years later!)
Anyway, last year I got the Garmin RV-GPS device because we were going to be travelling to Disneyland. That meant going through LA.
It worked beautifully. It shows an almost photo quality image of the exits, along with arrows showing what lanes you need to be in for the route you are taking. That was extremely helpful to us. I knew I didn't want to be doing the backup up routine in LA. Not cool.
We didn't get the traffic subscription, but it does get some traffic information. I'm not sure how it all works, it wasn't perfect for traffic, but good enough for us.
There were a few times I forgot to take it off RV mode and it would take me through long routes just to go across the street. So, if you are unhitched, you need to remember to switch it to car mode, then switch it back to RV mode when hitched up.
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