My 1-ton dually 4WD diesel pickup needs to be towed to the dealership... The tow truck driver showed up with a regular (not flat bed) two truck and plans on towing it with the front hooked up... ...
The NV-271 Transfer case may be towed rear down or 4-down if the T-case is placed in Neutral. You can tow the truck front-down (from the rear) with the T-case in 2WD and the truck in park, however there are distance limitations.
Most reputable towing companies use Industry standard towing guides which list the available towing methods for every make and model out there.