When my '12 CTT is in my garage (ie whenever I am not driving), I park it at regular height.
I almost never leave it parked at higher levels 1 or 2.
The "tuner" side of me likes to see it in the loading level when I am parked out&about (parking lots, etc). I like that look.
But it never stays in those places for long, whereas it could be in my garage for several days before I take it out.

I really don't see how leaving it in any of the positions could or should hurt anything (then again I'm a software eng, not a mechanical eng).
=Steve

 

From my observation, when I leave the car at the normal ride height overnight, I see no indication on the rocker of the current level next day. The system has to adjust itself once I drive off. This usually does not happen when I park the car at low level 1.

So, if the system is pressurized and holds the car at a certain level, would it be better to lower the car to shed some load on some components? Especially if the car is left parked for an extended period of time?

 

Hmmm, good question & thought process.

Do we need a expert on air ride suspension systems to answer?

 

I do not consider myself an "expert", but isn't the pressure the same regardless of the suspension height? The car still weighs the same regardless of the height level.

There is added pressure while the car rises, of course.

As the PDCC system relies on moving parts inside pressure cylinders, it is possible that the volumes or inner surface areas increase or decrease when switching height levels. Still, that does not necessarily indicate lower pressure at lower suspension levels. Or am I getting this wrong?

 

It shouldn't matter what level you keep it at. But lower level means less pressure in the system.

If you are at loading level it will adjust once you start moving (above 16km/h I believe). All other levels (except extended high level) it will stay with what was programmed. Even this is not in stone. The software automatically lowers the vehicle when you get to 150km/h.

It's very much like the tires on your car. When the pressure is lower the wheel deflates and your car sinks toward the ground. When you re-inflate it, it rises. Higher pressure is higher level.

 

I haven't checked the manual, but IIRC, highest suspension level requires the transfer case be in low (offroad) range.