While I cant disagree with the 4hi comments...
thats why I would buy the truck without a 'solid' front axle... no comprimise...
I have a 2500 4x4, and added a ARE cap.
The cap made a noticable difference when not in 4x4 hi and even in 4x4 hi, the more weight the better IF your not trying to float on the snow. The Cummins not being on a diet really helps how it handles, stock, in the snow.
I had a van with about 25 sheets of sheet rock in it, pulled into my mom-inlaw's un-plowed driveway without a problem, moved around so we could unload - no problem -... Untill after we unloaded the my van, I couldnt get the van out of the snow... . either need 4x4 or put the sheet rock back in. . so instead we got everyone to pile onto the back of the van, even her mom... . (her mom is a very dear woman, but a very large woman) and got it out.
With out the cap on my 2500 it was soo easy to light them em on dry pavement and had to really watch it in the rain... . the cap added to drivability while using the power when not towing or loaded. I have the stock Michilens(sp?) 245.
The cap weighs in at about 300 lbs.
After putting some weight in the back, remember to air up the rear tires. When trying to get down to the pavement in snow (not float on the snow), you want then aired up correctly. To much air reduces your contact patch, to low does too and also closes up the treads.
Bob