I Have installed Golanders on my truck, much lighter than yours, I currently run 50 lbs in mine, they are load range e 10 ply. Your post and the wear you experienced indicates the air pressure may have been a little to low. High air pressure would cause the center to wear more, low, the outside, just generally speaking, lots of other factors also would apply.
I like the Golanders, they didn't change the ride of my truck much, just a little sharper on some cracks and bumps, but much better handling when towing. Course i also have the air lifts and they help.
Good luck.