Most go to 6ft - I don't think American ones go higher than Asian ones.The height they lift the vehicle depends on the pickup points - if you can get the pads directly on the vehicle,it will lift it higher than if it has to go up some distance to pick up a lift point.Stiffness is sort of related to the capacity,the more load they are rated for the heavier duty they are.But the 4,000kg Korean one I use now is of much lighter construction than the 3,500kg American hoist I used before (in my own shop)