last time I dolly towed my Raider, I just stuffed a rag in it. If you tow often, I would get my hands on a slip yoke side from a junkyard and tie it into the transfer case with some bailing wire so nothing leaks and your seals stay in good shape. As eddy says, you can tie the shaft up. I just don't trust leaving it tied up on the poorly paved highways of PA.

Richard E
1989 Montero - Stock-ish
1989 V6 Auto Raider - 5.3 Vortech Swap.
1987 Mitsubishi Starion 2.6t, soon to be 3.5
1983 Honda XL600R