OK, trip report. Under ideal conditions, it should be possible for a 75D to tow a 2017/2018 Sport 22FB from Roseville / Rocklin to Truckee without CHAdeMO charging along the way.
How do I know? I left Auburn Gold Country RV Park with a full tank of 230 miles. I arrived at Nyack Shell in Emigrant Gap with 42% SoC, and at Truckee with 17% (37 miles left in the tank). The RV park is about 5 miles out of Auburn. Rocklin is 11 miles out of Auburn, so anyone charging to 100% at Rocklin should arrive Truckee with about 25 miles in the tank. If you're coming from Roseville at 100%, you're cutting it even closer, arriving with 12 miles in the tank. So top off at Rocklin.
Note that these are ideal conditions: dry and sunny, speed ranging from 45mph to 55mph, AC off for most of the trip and seat warmers only. I don't know my weight but both front seats were occupied, no passengers in the rear.
Arriving at Truckee,
My Trip A showed about 72 miles from Auburn to Truckee at 762 Wh/mi.
My Trip B showed 252 miles from Half Moon Bay to Truckee at 647 Wh/mi.
If you get to Nyack Shell at Emigrant Gap with anything less than 40% SoC you should probably avail yourself of the EvGO CHAdeMO they have there.
Detailed report in chronological order:
We left Half Moon Bay with a full tank.
We first recharged at the Tesla Service Center in Dublin. We arrived right around closing time. I'm traveling with an MPDG, so while we were mulling options a Tesla exec appeared out of nowhere and generously invited us to use the service center's secret supercharger that they usually use to top off customer vehicles. So we didn't have to unhitch! We probably left there at about 75% SoC, I don't remember exactly.
We went past Vacaville which are all back-in stalls. We hoped to make it to Rocklin but ended up at Roseville, 109 miles later. Nobody else was there so we just went ahead and blocked most of the bays. We arrived with 19 miles in the tank, charged at 90kW, and spent only about 15 minutes there because the next stop was just 20 miles away.
We popped by Rocklin to check out the layout. The solar roof claims a clearance of 9', which is a problem because the Airstream's AC reaches 9'3".
It's probably possible to nose in to the bays but I wouldn't pull all the way through.
We spent the night at Auburn Gold RV Park, about 20 miles away, and departed with a full tank thanks to the 50 amp service in our bay.
Auburn Coffee has excellent espresso, nitro cold brew, and kombucha.
The next day we made it all the way to Truckee without charging along the way, though we were prepared to bust out the CHAdeMO adapter at Emigrant Gap.
