We have been towing a 2013 cmax energi on a tow dolly for almost 2 years. There have been no problems towing the car. No extra miles accrue. The only problem is when it is wet the car can slip going up on the dolly. We have been on a 3 month vacation and we are going to have our car wired for 4 wheels down when we get home. There was too much rain on this trip and it was sometimes hard to find pull throughs to accommodate our length. Having to remove the dolly and push it around is a young persons game. When this happens it takes days for my husband to recover. But the car towes grest on the dolly. Absolutely no battery problems. Just put ramps down,drive up, set the brake, put car in park and turn off, put on safety chains, wheel basket straps, tighten down, remove ramps and release brake. That's it.