Just curious. I think they run them on the dually's. Wondering if anyone was running them on a SRW. Fraction taller than the 265 but narrower than the 245.

I think the dually's run 215/85/16 stock.

My winter tires are 235/85/16's on PYO rims. The 235 has the same weight rating of 3045 lbs each that the 245's have.
I'd expect the 235's to get better MPG than 245's.
I run 265's on Alcoa 16 X 7" Classic rims in summer towing the 5ver. The 265's have a higher weight rating of 3415 lbs each.
IMO, my 2500HD with air bags and Alcoas with 265's has an equivalant weight rating as a SRW 3500.

I run the 235's on the plow truck for the winter, have since 01.

Yup, Revos on stock steal rims.

Do they give a better ride, better mileage, or what? I know a narrow tire is better in the snow. All my driving is highway. Thought it might improve the mpg a bit.

I ran a set of General Grabber II last winter in the 235/85/16 size on my 2004 2500 CC SB. I went with them to retain a height like the 265's, but be narrower for less floatation. I liked the way they worked EXCEPT for how quickly they wore in the rear. I'm not a heavy-footed driver, but these literally were pealing right off. First trip was about 300 miles and when I returned, I check the tires for wear and was shocked at the way they looked. Called the distributor and a couple GM dealers and they both said that the torque of the duramax actually spins the rear tires even though you don't realize it. And that it's especially noticeable with narrower tires. I thought it was strange, but made sense I guess. I rotated the tires constantly last winter, but they were more than half worn out by 7500 miles. I run 285/70/17 Toyo's on H2 rims during the summer and they wear fine.

I ran a set of General Grabber II last winter in the 235/85/16 size on my 2004 2500 CC SB. I went with them to retain a height like the 265's, but be narrower for less floatation. I liked the way they worked EXCEPT for how quickly they wore in the rear. I'm not a heavy-footed driver, but these literally were pealing right off. First trip was about 300 miles and when I returned, I check the tires for wear and was shocked at the way they looked.

I wonder if this is a tire brand or type issue, and not related to the tire size.
If you're referring to the General Grabber A/T II, this appears to be a traction snow rated tire.
If it's like other snow or ice rated tires that have a very soft compound, the life of these tires is only around 25K miles. The soft compound is great for traction, but has a much shorter life than highway type tires. If this tire truely has exceptional traction as stated below, you usually don't get something for nothing.
Is this your tire?
http://www.generaltire.com/generator/www/us/en/generaltire/automobile/themes/van/all_terrain/grabber_at2/print_data_en.pdf

I run 235/85 on both summer and winter tires. Can't say I saw any increase in mpg. My main beef with the 265/75 was I couldn't get chains on the front tires without cranking t-bars and I don't want to do that. I do miss the extra weight rating as I'm really close to max with the 235's when moving hay.

I don't see any premature wear on the back tires. Buddy of mine goes through back tires fast but he has a steep gravel road to his house and I'm betting that's what kills his back tires. Probably slipping a little all the way up and getting chewed up by the rock.

My main beef with the 265/75 was I couldn't get chains on the front tires without cranking t-bars and I don't want to do that. I do miss the extra weight rating as I'm really close to max with the 235's when moving hay.

Just a thought,
have you considered running both tires sizes? The difference between 235's and 265's is only .1-.2", per tire info. This difference could easily be compensated with air pressure. Measure rolling radius with different pressures.
All your load weight is on rear axle. The front axle weight on my truck with or without my 12K 5ver loaded only changes 100 lbs or less.
You may have to spend $ on two more tires, but if willing, you could install chains on 235 fronts and not adjust t-bars, and have 265's with chains on rear for higher weight rating.
Depends on what you want, need, and are willing to spend.

i run them i just dont like that they are skinnier than my 285/75 were, other than that cant complain

I wonder if this is a tire brand or type issue, and not related to the tire size.
If you're referring to the General Grabber A/T II, this appears to be a traction snow rated tire.
If it's like other snow or ice rated tires that have a very soft compound, the life of these tires is only around 25K miles. The soft compound is great for traction, but has a much shorter life than highway type tires. If this tire truely has exceptional traction as stated below, you usually don't get something for nothing.
Is this your tire?
http://www.generaltire.com/generator/www/us/en/generaltire/automobile/themes/van/all_terrain/grabber_at2/print_data_en.pdf

Modified, yes, I know the soft compound doesn't help tread life. These were for winter use. And, yes they did have great traction, no complaints at all about the tires besides the short life. I work for a friend at one of his tire stores during the winter season when my pool business is shut down (hard to work on pools in the snow...). When I buy tires for myself, I shop compound, traction ratings, etc--probably a bit more than the average Joe. I do believe this is more of a width / contact area issue as it has also been seen with other tire brands in 235 and 245 widths on trucks running the diesel or the 8.1 big block. Also, it is only the rear axle that is pealing away, the fronts wear fine. The fact that the GM dealerships by me say they are aware of it, and have a "reason" for it, helps make it make sense. So far my 08 with the 265 17's hasn't had any noticeable rear axle wear over the fronts. I'll run the stock tires for this winter, unless they suck in the snow, and I have my 285 Toyo's for next summer. I would definitely purchase the Grabber IIs again, but I would be looking for a wider tire next time.

The Revos on mine have 20K on them and are fine. Looks like they will get 60K total mileage like the other Revos I have used.

My only complaint is that you need to keep them rotated more than a stock tire and kept in perfect balance. The 245/75 Revos I have used before were perfect in balance and never really needed rotation. I believe it to be the narrower contact patch of the 235/85s to the road being more finicky.