So this is another settling air suspension situation, but with a weird twist.

My street has a slight incline (10-15% grade) and I've noticed that if I park facing uphill, the rear drops, but if I park facing downhill, the front drops. Takes about 5 or 6 days for it to drop noticeably, so not a fast leak if it is a leak.

When I first got the truck I went through the troubleshooting tips of removing the self leveling fuses, but the truck didn't drop at all when I did that.

Could it be the self leveling itself is a little wonky? How does that work?

 

could be bad sensors, could be bad calibration, etc.

 

...could be nothing at all. Sounds like it's lowering the heavy side. Also sounds like with fuses pulled there is no dropping. Don't over-think it. If it's working then leave it be. I don't know the algorithm that goes into the self-leveling function.