The truck is the zr2 model, crew cab short bed. i was towing a 2100lb trailer with 347# of tongue weight at 25mph, uphill, on a dirt road. hit a dip in the road at 25 mph and it bent the frame at the cab/pick up box area. the frame necks down to 3 1/2 inches there with 2 factory large oval holes on both sides of the frame. i have found another pic of a zr2 towing a trailer, and it bent at the exact same place.