900Kgs is approx 1 Ton (2000lbs). When you add the weight of your ATV's (3x750=2250lbs),you get 4250lbs which is only approx. 2000Kgs....well under your max GVWR. Passengers,fuel and gear will need to be added,but,unless you're hauling with a small car,SUV or compact pick up,you should still be well under the max.