Ty, my thought would be that your airbags or whatever mechanism would give you your height gain and then lowered down to minimum height to clear under the parking space. Problem with this is you'll be running around on inflated bags to clear your tires when you're out of the parking space. Keep in mind what you are trying to achieve is not ground clearance issues, but low height clearances. So the system you would want is something just for that purpose and then be back to your normal suspension height. From reading on this forum you might be able to use the same setup the LX470 has, but from what I read the height variable is only under 4". One option would be to remove your stock roof rack which should gain you about 2"....not sure if you already done this. Is the problem just clearing the entrance part of the parking space? Or is the height the same throughout the whole parking space? If it's just the entrance part then there is an idea. Now I've dealt with hydraulics in the past so I know that it forces the pistons to extend, but maybe there's a way to design something to compress the suspension just so you can clear the entrance and once you're in, release it. If this can be done, then a lifted 80 or 100 can really go anywhere; meaning evening in low parking garages.
Carl