Towing is ok as long as all 4 wheels are on the ground and turning.
DO NOT use the rigs which lift 1 pair of wheels off the ground and leave them stopped or you will damage the centre diff - and that's if the car doesn't break free from the rig.
On 185's there is a small lever underneath allowing you to disengage the centre viscous coupling or even switch to 2WD. Not sure how this gets on driving the gear oil pump though and whether the gearbox will die due to lack of lubrication.