Ditto, and they should not be the same all around. The truck is made of hundreds of parts, and variations in fenders, body mounts, the frame, control arms, and mounting hole tolerances, those affect ride height.
The suspension should be level, not the body. The suspension does the work, the fenders are just hung there for looks. Doesn't anyone ever watch car racing, and know what handling balance is, jacking a corner etc?
When you make the suspension not level, the truck doesn't handle the best it can. It will be better in one direction and worse in the other. That may be great for a circle track car, NASCAR etc, but bad for street use.
Make the suspension level, measure from the suspension to the ground, on level ground. Find a suspension point at each corner, and make the left and right measurements the same. Do that and then go get an alignment. No one on Earth can look at your truck and tell if the left fender is different than the right, plus they don't care. Worry about the suspension, the handling and safety. Regards,