The 285 is only availible in the D range. However, the 285 D has the same load carrying capacity and the stock 265 E tires.
Some people get all excited about having to have E rated tires, and I suspect you will hear from them shortly now that we have opened that can of worms
I will just share my personal experiences, and you can decide for yourself. I have run 285 D tires on all of my SRW trucks since 2001, four Dodges and two Chevy's. Two of the ucks hauled commercially for my business and were always loaded up to or beyond the trucks CGVWR. Most recently when moving household goods from MN to CO (three trips), my truck scaled at 24k+ and I ran it that way over all the steep and curving mtn passes CO has to offer. You will hear testimonials as to how D tires are unstable, blah, blah, blah. I never had any problems in hundreds of thousands of miles. No complaints from me or my professional drivers. Bottom line for me is that if the weight rating number on the sidewall is not exceeded, the tire is safe to carry that load. The letter is an antiquated guideline IMO. Now get ready for the barrage of E lovers:-laf