I had a 01 S-10 with the 4.3, Auto, 2wd. I loaded my Jeep onto my tandem axle trailer, and my Honda Hawk in the bed and drove all the way across the country, no problems at all, and could cruise at 70. I have electric brakes on the trailer, and I had Firestone AIr Bags on the truck. The only other mod was a K&N FIPK.
The Jimmy should pull the Zuk w/o any problems. Just make sure the trailer has breaks and you'll be set. You could also Flat tow the Zuk.