I've been towing my CT with my VS. Other than going offroad to places that needed clearance, it was fine. What is it about your VZ that isn't getting the job done, that a smaller engined Pajero will fix?
I agree with this. Why go for a vehicle with sh!t fuel economy. If your not off roading, look at a station wagon. The VZ wagon has a pretty large cargo area. Or possibly one of the Holden AWD wagon's, the CX6 or CX8. The latter has atrocious fuel ecomony, but boy it's fun to drive. Or a VE wagon, smaller cargo area, but good towing capacity and bloody comfortable.
Being a Ford man, I'll put in a vote for the Territory as well, comes in AWD, Diesel, 7 seats, sat nav, and again, miles in front with regard economy compared to a 4WD.
These two makes of vehicle have more towing capacity than a lot of 4WD vehicles as well. Usually around the 2300kg mark.