You can have 3 wheels "on the ground" and still have the jack stand carrying half the weight of the car -
A pair of 2000 lb stands can support 2000 lbs, not 4000. Stands are solad AS A PAIR and the rating is FOR THE PAIR.. So, ONE stand is good for 1000 lbs, not 2000 - and the curb weight of a K-Car is a minimum of 2300 lbs. - so if ONE stand is supporting one side of the front of the K-Car, it will be shifting the weight of the car to the opposite rear wheel - taking load off both the opposite front and the same-side rear wheel - so the stand is taking a load SUBSTANTIALLY over 1000 lbs.
If 2 stands are used under one side of a car, the car transfers weight to the opposite side, and the 2 stands combined are holdinf substantially UNDER half the weight of the car. If the 2 stands are used under the front of the car, depending where the stands are located they can either transfer load to the rear wheels or take load off the rear wheels - so the stands can be taking close to half the weight of the car, or substantially more. 2 to jack stands are "light duty" stands. Knowing how to use them properly is required to be safe.
This doesn't take into account the folly of using them on irregular or soft surfaces, which can put over 30% more load on each of 3 legs contacting the floor if one is not contacting the floor.