[guruerror]

This is an AWESOME write up! Excellent detail!

I've got the same setup as you and thought that I too still had a slight rake, but the body of the truck itself seems to rake downward as it goes toward the front.

I always take my 'level' measurements at the front and rear of the rock sliders since they're level with the frame; even with them equal I still have about an inch clearance difference at the top of my Gobi...the front being about an 1" lower (6' 8.75" at the front of the front of the rack and 6' 9.5" at the rear).

FYI: I take my roof measurements by laying a level on the rack, letting the end stick out off the side of the truck, then measure from the ground up.