Originally Posted by LTrainGC
There is no difference in overall diameter between the 18" and 20" - they are both 30.5" (265/60/18 vs 265/50/20)
QL in park mode lowers the Jeep 1.5" from normal ride height.
My guess would be that the seat height at edge is 29.5" from the ground in park mode.
I'd strongly recommend trying one in park mode. The missus is a bit altitude challenged and can only easily enter/exit the 2014 when it is in park mode.
There is a TSB for the thing showing continual "raising" status when exiting park mode. Allegedly cured with a flash of the doohickey, but can also be gotten rid of
by dropping out of ECO and then back.