jktowhere, I've also contemplated the US to Ushuaia trip. I also already own a J30, and have also looked into internet options as I'm a developer who can work from anywhere so long as I have my laptop.
The primary thing preventing me from going was that I didn't want to go alone. I contemplated partnering up w/ a small group of touring motorcyclists and acting as a pseudo support vehicle but those guys go at to fast of a pace for my taste. That, and I wouldn't be able to get any work done.
Regarding your questions:
- What do you mean by safe? Would I camp out in a park full of drugged out hobos? Unlikely. Have I camped in parking lots next to dozens of others doing the same? Absolutely. Slept great too!
- I'm not sure I see anything wrong with doing 32k w/ the J30 on top. The worst thing you might do is tear some canvas or break a latch, both can be fixed or jerry rigged easily enough.
- Internet is a bit more of a challenge. All satellite based options are spendy and slow. The hardware can have a sizable upfront cost, and mounting it on the roof may limit any potential storage. If you don't need it always on, then you're much better off looking into just getting a SIM for a mobile hotspot wherever you are at.
- I had a large folding solar panel for when I was at Burning Man. I sold it because it was too cumbersome but have contemplated either getting one permanently affixed to the roof like we've seen on this thread, or more likely paying the extra price for a roll-up panel like Ursa Minor sells.
Keep in touch if you get more serious about doing this!
-James