I wouldn't let it get into overdrive, your torque converter may never well lock up.

Heres the way I look at towing in the Vx:

The driveline is straight out of a trooper. On my old 93, the max allowable tow weight was 5000lbs. I tested this once, towing a Pb-keeled (Lead) sailboat from North Carolina to Key West and back. While accelerating slowly is managable, many people overlook the slowing down part of the equation. The brakes on the VX are more than adequate to stop IMO, but just be careful because of theshort wheelbase.

On a related note, I towed a ~5000lbs wooden shed on a 2500lbs flatbed trailer up a hill in the trooper once. Probably did some damage to it, but it made it up.