The camper does look a little canted to the rear, but either it is or it's not. Measurement of gap between bed side and camper the same front to back? Is bed the same depth f to r? Pretty sure it is on those Chevies.
Could be a bit of an illusion because the whole setup is pretty @ss heavy and looks like it's taking weight off the front unless you have the torsion bars cranked up.
Guessing it's sitting pretty deep into the rear springs especially if that's with an additional 1" lift.
What matter is how it drives. It just looks like that big camper combined with the trailer weight is really heavy.
You said it's @ss down 1/8" in what, a few feet?
Multiply that by 8 and its an inch, maybe more with the trailer on.