Do not quote me, but if one can find 285-75-16, you are in the 3800-3900 range vs 3750 for the 17" 70 series version.
Then again, a 285 may take a wider rim than a 265 width tire. so make sure you have the width. A local tire deal last wednesday when I got new tires for my C2500, tried to sell me 265-75-16's instead of the stock 245's....on 6.5" rims. WHile I know many of you have done this, my experience has been horrible vs 7.5" rims. So no, he was not putting 265's on my truck!
Oh, the lowest capacity LR E tire "I" know of, is a 215-75-16 at around 2500lbs.....a bit lower than the highest in the 3800 lbs range!
"IF" one really needs more tire load capacity, I would look at 225-70-19.5, also 31.5" in diam as is the stock 265-70-17 rubber, if you go to an LR H ie 16ply tire, you get iirc close to 4500 or so lbs per tire from the label on the rear of my mdt with 4 of these. I have 16-17K or so label capacity with the 4! This would be MY first choice.
Marty