Hi
Q1 Here in Spain I know that people have fitted solar panels with no problems. That said, I have the standard setup (no extra leisure battery) and I go off-grid for 4 days at a time with no issues. I also carry a power pack to keep laptops/phones etc charged to reduce the load.
Q3 Over here it is very common to retrofit.
Q4 Upstairs is more comfortable but downstairs is fine too (I use it without a topper). The fact that the back part can be set at various angles might help too.
Q5 The edges of the windows are opaque (I have tinted windows) so even if the blinds don't appear to cover the entire window they are effective. I gave up fixing the front/side window curtain (too much hassle) so instead have strung a cord between the two knobs where the roof straps attach to the raised ceiling, and I hang a large dark microfibre towel across it. A couple of pieces of velcro and it provides an opaque barrier hanging just behind the front seats.
Q9 Yes, they do attract detritus, but filling them up would take a long time. I just hoovered mine for the first time after a year of ownership (including mountain trips, muddy boots, dog) and there really wasn't that much to take out. It is more aesthetic than anything. What is a slight issue with the rails is the rubber edging that has a tendency to lift (in one place, near the back in my case). It can be forced back in place though.
Q10. YES! I had to get a tow (fortunately it was at a steam fair, so plenty of volunteers). Just take care where you park -- not at the bottom of the field in any circumstances. My excuse is that I was marshalled into that position...
The only issue I've found is that the worktops get scratched easily, so they need to be covered if you mind that kind of thing.
We couldn't be happier with ours. We've done around 17k in the first year with a mean 6.8 litres/100km. I also use it as a daily commute. The automatic drives like silk as they say over here.
Interesting to read about service intervals. I'm just about to add any extra 2k on heading up to Scotland next week so I took it in for a service as I'd heard from somewhere that it was due at around 18k (that must have been from the service plan I was offered but turned down). They pressed a couple of buttons and said bring it back in 340 days....
All the best
Martin