We have a Lincoln MKZ as well and a Toyota Highlander we use with a ACME dolly with surge breaks. We use a dolly since it gives us the freedom to take whichever vehicle we want. We also pull a jeep wrangler four down. I would not worry about the size of the dolly tires as long as they are rated for highway speeds. We have well over 10k on our ACME with no problems. The ACME dolly uses inverted steering so there is no way it will damage your car on sharp turns. You will get a lot of different opinions but I would get what appeals to you.