It ended up working out great with the large roof box. I rented this one:
Thule Motion XT XXL (for €105 for the 2 weeks) which had enough space for my
mountain bike and my sons
Woom Off 6 plus a bunch of odds and sods. The little one's
Woom 5 went in the trunk with our luggage for 2 weeks. We (2 adults + 2 children) drove from Frankfurt to Cortona and back (via Portovenere and Turin) with the roof box on, and spent 2 weeks exploring Tuscany without the box (as we just stored it at our rental).
Total distance with roof box 2,400km, total distance of trip 3,359km - consumption 688 kWh or 205 Wh/km (which interestingly is less than my lifetime average of 210Wh/km ???).
Going 130km/h with the roof box had consumption up to between 280-310 Wh/km, which is 70-100 Wh/km more than when I drive without the box.
Overall, I'm really happy with the setup and will do it again for sure.
Negatives:
- noise level with the roof box is noticeably higher, but no where close to what I had with bike racks on the old ICE cars
- the Thule Motion XT XXL is so long, that the trunk can't open all the way and you have to set the limiter on the Model S to avoid puncturing the windscreen - access to the trunk is a little limited, but overall fine.
Gräfenhausen Supercharger
Top of
San Gottardo Pass