I just had my 57 Chevy 6700 Wrecker w 2 Ton rear towed on a Rollback about 35 miles, and they were charging me $110/hr. Final bill $385. Truck was not under it's own power, and I didn't have to lift a finger; other than opening my gates.
We were tall, but we made it under all the bridges and low power/telephone lines.
You might also want to be aware if you tow the truck on it's wheels over the highway you probably need it to be registered, and legal to be on the roads even though it's being towed.
http://www.flickr.com/photos/donnoman/sets/72157625095804541/
