HF sell 12 ton jack stands that raise the car up to 30"
I use a set of 4 on a diesel truck and regular cars. Rock solid and cheap(on sale) 12 Ton Jack Stands
The only issue I see with that is getting the car up to the lowest height of 19.5 inches. 6 Ton axle stands start at about 17 inches so you can get the car to that height using regular 2 or 3 ton stands.