This is a copy of one of my posts on another forum I belong to. It applies here to some degree, maybe you can use some of the information to help with your decision.
These are just my observations and opinions, and we all know what they say about opinions!
I think 4x4 on a truck that size is a waste of money.
I have the opposite opinion about 4x4 on a 1 ton diesel. My 2 wheel drive diesels would get stuck on wet grass. Too much weight in the front end, and not enough in the rear for traction.
I will list the trucks I have had along with the good bad and ugly, and some photos to show how I work my trucks.
Dodge
2002 2500 4x4 diesel 6 spd - It is currently sitting outside my office with a 32' tandem dual hooked to it, and a dozer and 4 seater mule sitting on top of it. The truck has just under 200k, I have replaced the injector pump and lift pump, and clutch, and I grenaded the transmission
2003 3500 4x4 diesel 6 spd - I have had several problems with this truck, some self inflicted such as the turbo, injectors, and clutch (too big of a performance chip for the stock components)
Lets see a 2 wheel drive pull this load out of the muddy hay lot with 20 rolls of hay.
Pulled this 42' long trailer all over the US, averaged about 8 MPG
Ford
1995 Ford f350 4x4 7.3 diesel 5 spd - This truck was OK for pulling, better than my nonturbo 7.3, but not as strong as the dodge. If I would have sold this truck at 200k instead of 240k I would have been money ahead. I replaced the injectors, CPS, transmission, Clutch, front hubs, etc.
4x4 does not always save you, but I would rather have it than not. Let's see a 2wd diesel make this drive
1997 Ford F350 4x4 7.3 diesel auto - Sold it with 130k, It was a nice truck, but it always felt like it was laboring to pull a load. Largest load I ever pulled with it was a 34' Airstream Limited.
2002 Ford F350 4x4 dually 7.3 auto - same story as the 1997 ford, except that when I blew the turbo on the 2003 dodge, I used it to haul the dodge back home. You should have heard all the trash talking on the CB that day.
2003 Ford F550 4x2 6.0 6spd - This truck is used daily hauling a 40 flatbed, none of the problems I have heard about with the 6.0. It has had the a/c and transmission replaced.
2004 Ford F550 4x2 6.0 6spd - same story as the 2003, except that it feels like it has more power down low than the 2003. No head gasket issues with either one.
(2) 2008 Ford F550 4x2 6.4l 6 spd - Both of the are run daily hauling either a 40 gooseneck, or a 45' gooseneck. They have been back to the dealer on several occasions to be reflashed. No major components replaced YET!
Chevy
2003 Chevy 3500 4x2 Duramax/ Allison - plenty of pulling power, but horrible fuel economy. Sure like the tow haul mode in the truck.
2004 Chevy 3500 4x4 D/A - same as above
2005 Chevy 3500 4x4 D/A - same as above - the chevy's are nice for hauling light loads, and they ride great, really like the interiors too.
Here is a load of 300 square bales on the chevy,
With all that said. I still own the old goats. Got rid of the Chevy's, and the older Fords. The Chevy's just drank too much fuel, and the Fords did not make the power that I needed.
If I was going to buy a truck today, I would search high and low for a clean, low mileage 1998 Dodge 5.9l 12 valve 4x4 quad cab. Great mileage, and none of the emissions crap. The new diesels don't have the mileage gain anymore that used to make them better than a gasser. If you need a newer vehicle, go with a gasser over the diesel.