Anyway, any impressions on the physics? Preferably from those who have also played Reiza's Formula Truck/GSCE/AMS as a baseline reference.
I've played Formula Truck, although not for a few years. The trucks in ETRC don't feel radically different from what I remember of Formula Truck. The simulation here clearly isn't on the same level as an RFactor or Project Cars; there's no tire temperature effects, track conditions don't seem to evolve over the course of a race, or any of those sort of in-depth details. However, the basics seem pretty solid. Understeer, on-throttle oversteer, and lift-off/braking oversteer all manifest themselves pretty much how you would expect, and the trucks move around pretty much the way they do in the real ETRC races I've watched online. You can slide them around a bit, and catch slides pretty well (because they spin out so slooooowly), but to drive fast you have to be smooth because it's easy to scrub off speed if you over-drive the truck, and then it takes forever to get back up to speed.
Overall I'd say it's not the most in-depth physics simulation ever, but it's definitely not an arcade game. IMO arcade racers always have way too much overall grip, and never seem to exhibit lift-off oversteer. On those counts ETRC makes it into "sim" territory.
One disappointment is the lack of some licenses. MAN and Scania trucks are debadged, and as previously noted the Hungaroring is missing. There is, however, a fictional "World Series" championship which lets you drive the trucks on some non-ETRC tracks. Laguna Seca is included — the Corkscrew is as epic as you'd expect in a racing truck. The "World Series" also includes several trucks not present in the ETRC, including branded trucks from Freightliner, Mack, and Western Star.
The other main disappointment is that the AI is pretty weak. I'm a decent driver but not the very best, maybe 10th-15th percentile in most sim racers, and I find the AI pretty easy to beat on the hardest difficulty level (of which there are only 3). Maybe they can patch this later, but I'm not sure what level of post-launch support to expect from this developer.
I haven't really messed with tuning yet, as I find the default "balanced" setup pretty good. I glanced at it and the amount of tuning options seemed pretty limited, but I'm not sure how much is adjustable on the real racing trucks. Oversteer under braking seems to be my biggest difficulty, so I might try to see if I can tune it out without making the truck too understeery.
The game lacks polish and the graphics are dated, but if you're looking for a pretty solid driving experience in a very different sort of motorsport, I'd recommend it. I'm sure I'll play through the full ETRC championship at least once, and then decide whether to do the fictional World Series. The full race weekend format of the ETRC is simulated, with practice, qualifying, superpole, race, and top-8 reverse-grid race on each day of the race weekend, so there's plenty of driving to be done. You can choose 25%, 50%, 75%, or 100% race distances.