I believe the Stehl will serve your needs. My thought would be to find out if they offer it in different widths. For your application/concerns, I would go with the widest they offer. That would lessen the possibility of the dolly wheels making contact with your car during sharp turns.
The Acme should do the job as well. It's designed to allow the car wheels to pivot so a steering wheel lock is not needed. Friends of ours have been towing one for several years without issue.
Our Demco SS uses surge brakes and we've found them to work very well. As for tire size, I believe the new Acme units are using 12" wheels. Ours uses 14"... as noted above, the weight and speed rating are probable more critical than diameter.
Gary