My advice would be stick with the Garmin V and forget all of the rest. Your laptop you want sealed away from dust, water and view, not paraded on your dash attracting dust etc.
Everytime you want to get out and wonder around for a while you will have to pack the laptop away somewhere. Things like that you will have to do hundreds of times during the course of your trip and slows you down and puts you off from stopping etc
Spend as much money on the mechanics of your vehicle, on making yourselves comfortable and healthy, on extending your trip, doing cool things when out there and experiencing the local culture, not on gadgets and whizzbangs that will further alienate yourself from them (though I realise how tempting this is when your waiting patiantly to actually leave - spend this on learning mechanics and driving practise etc).
(I've plodded all over the place with a GPS 3 and waypoints from the internet combined with a good map)
Just my view anyway....
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