I was doing some research a few months ago on a buying new tires for the winter since I'll need a good snow tire vs the stock Bridgestone's.

I was going to go with 265's but other than filling in the wheel well better is there any other advantange vs staying with 245?

One of the advantages of the 265/75/16 tires is that they are taller, giving you lower cruising RPM's as well as a higher theoretical top speed. I got rid of the 245 as soon as I bought my truck and have never looked back.

I just put 285's on mine. Its night and day between the 245 and 285. I did not have to alter the torsion bars either.

if you put tire chains on there isn't much room with 265/75/16's. My preference is 235/85/16. Just as tall as the 265/75's but same width as 245/75. My chains fit then too.

Don't put on a underpowered vehicle if you are towing near capacity same as changing rear end ratio.

Most I'll pull is 3000 - 3500 # tops hauling sleds in the winter. I don't think I will be doing much off road with that truck either - at least not being so new :). Most of my use of the truck is traveling with the quads or sleds so I need some good mileage and also good wet/snow traction.

I have TOO MUCH experience pulling sled trailers of all sizes with my duramaxes. My reg cab had 285 Good Year MT/R's, and my crew cab 06 has pulled a few with 285/75/16 BFG All-Terrains.
As long as you keep them aired up, you will have no problems.
I moved to Missouri recently, and had the truck LOADED and was pulling a 6X8 U-haul trailer that was loaded to the max. Had the 285's aired up to 65 and had no problems at all the entire way here.
If you are really worried about load capacity, you can get the 285 All-Terrains in load range E if I am not mistaken. Most tire joints will have to order them though, as I don't believe they are a stock item.
FYI, my BFG's are load range D.

I also have many years experience pulling sled trailers. I am also a mechanical engineer, so I understand friction and traction. I would never put wider than 265 tires on for pulling on icy roads. As soon as my winter tires wear out, I am buying a set of 235/85's in a dedicated snow compound. You need a narrow tire to put more pressure on the road to give the most traction in snow and ice conditions.

You need a narrow tire to put more pressure on the road to give the most traction in snow and ice conditions.

hit the nail on the head. I run 235/85 on both my street and winter tires. It's amazing how much more traction I get in the winter vs. guys running wide tires. My winters averaged 10-15 feet of snow so I'm pretty much dealing with ice for half the year it seems like.

245's will work just fine. A 235/85 is 10 mm narrower than the stock 245's, but it is taller, because it has a 85 aspect ratio vs 75. What that means is that your sidewall height is 75% of your first number, 245.
So your sidewall height in mm on the 245 is 183, and on the 235 it is 199. Therefore you have a tire that is narrower but taller than stock.

If you are going to stay with stock wheels, and you don't want to drop a huge amount of coin on tires, I would go with either the 235/85, or the stock 245/75. I would not go wider because then you putting the larger tire on a rim that it is not designed for. Plus, like mentioned earlier, narrower tires put more weight/square inch, to give you more bite. If those are your concerns, then I would stay with those two sizes. You should be able to find ample offerings of snow type treads in those sizes.

Good Luck with your choice.

Here's my 235/85 R16 E Cooper Discoverer STT

http://i2.photobucket.com/albums/y47/trouttrooper1/Tire2.jpg