I think if lowering can be done, heightening sure can be. I am not sure if there is anyone out there selling heightening springs. You may have to have the springs custom made. But If you have airmatic suspension, I think you can find buy a module/software to adjust the height. If you can find longer springs, plus installation will probably cost you about $1000. Airmatic suspension adjustment module will probably cost you about $1800 to $2500.