Is the Sport Track Towable?

Short answer, no. The 4WD version would be flat-towable but the 2WD version is not flat-towable. Although I have seen people towing trucks similar to yours in a reverse way -- rear wheels on a dolly -- but I don't think it's recommended.

Penske truck rental says, "Hell no!"

not true yes you can .simply disconnect drive shaft

I have towed ford pickups (rear wheel drive) long distances. Just remove the driveline from the PUMPKIN. If you want to make sure it goes back to the same as original then paint two of the nuts on one side. Do the same with end of driveline. Mate them back together when done towing. Tie drive line securely to frame with nylon quick ties. While towing and you stop to check tow bar assembly check the driveline also.

Drop drive shaft at the differential. No need put in neutral? But must unlock steering wheel. Right.