Thank you for the photos of that eBay rig, it is the first 4x4 i have seen that has the center caps modded to fit!
I have the same setup on my rig, 01-07 Duramax rims with 285/75/16 tires.
My truck is an 84 K20, 6.2 diesel,700r4, 8600GVWR with quad front shocks.
I got these 285 tires in a trade, I was actually originally wanting 235/85/16's.
I had 265/75/16's before, first gear was very short.
The 285/75/16's help with that a little, but for sure help with 4th. My RPM's at 60-70 are a good bit lower and I feel like I can drive on the interstate without beating on my 6.2.
If you do a lot of hauling and need that extra torque, id stay with 265 tires.
I'm very happy with my 285 tires.
