Tioga Won't Budge after long neglect. Help, please.

There's a good possibility that your brakes are 'seized' or badly rusted. Service brakes or parking brake. You may have released the parking brake pedal, but the actual brake may still be on. Also the service brake rotors, pads could be badly rusted.
The extra power and traction from the tow truck may be enough to free them up to be towed. When you get it home, time for a good inspection of all.

Ken