I hear ya guys. My house was built in 2006 so the driveway does ungulate.
I've measured many times on different locations. Forward, backward, in another parking lot ect....
From my observations and research, it seems trucks with self leveling air shocks have a greater difference in height front to rear.
It may be that the air shocks keep the rear "up", decreasing the sag or fatigue of the rear spring. This in turn causes the front springs to absorb more of the weight causing the front to fatigue and settle more over time than a non-air rear strut.
In short, a standard rear strut has less of a difference front to rear than a air assist rear truck.
Well, that's my hypothosis so far.
Either wayI ordered the 2.5 kit. I will post pics of it before and after when I get it done.
Thanks, Steve.