Need 4X4 - only if you live where you get allot of snow. We are in snow country so a 4X4 is a must for me.
Get the 3500HD - higher payload and the ride will be close to the 2500HD.
The 4X4 has come in handy pulling in and out of some camping areas after allot of rain.
I do not think the mileage is that much different. Re-sale will be higher.
3500HD info:
The 2WD 5th wheel towing capacity is about 500 lbs higher (at least it was on the 2011s - - 17,300 lbs 2WD, 16,800 lbs 4WD. The conventional towing is the same - 13,000 lbs. The payload on a 2WD is about 300 lbs more
The 2011 and newer trucks are a great towing rig - I have had a Duramax since 2004.
