Not sure if it makes a difference or not, but my Titan has the equivalent of a 3.55 open diff. Air the tires down to 10 psi, don't stop, and if you do stop, don't back up. Always park facing down hill.

So far the only time I got stuck was coming up the road to camp, and that's only because I hit some whoops and I had to stop. Then when I tried to go again, with 1000 lbs tongue weight it just dug.

My buddy's 2500 Duramax pulled me right out.

 

i think my problem was street pressure and no momentum.