4x4 of course... never buy a 2wd in Pacific Northwest!
"Laughing"..I here this all the time and a 2WD dually works just dandy in the snow,we get a lot of it..
Last year I tested my son's 4X4 Chevy 2500 HD against my 2WD dually,both in 2WD...He was shocked and disappointed to find out that in 2WD the Dually smoked his in 2WD..More meat on the ground..
Think about the UPS Dually trucks..They get there cargo delivered and in some very heavy snow,Elk City here for an example..The school buses are all 2WD duallies and the kids get to school..
And get this,some of our city snow plows are 1-Ton dually's with a dump bed filled with snow..And ofcourse the semi's or atleast some, do not have lockers to lock both axles in for the 4X4 effect,kinda...
A 2WD dually does just fine in the snow if the driver does his part..I probably have the record here for chaining up semi trucks..Several times a day they went on and then off day after day in the snowy mountains with logging trucks...
I bought a 2WD dually because I new the worst I would have to do back in is chain up and it was what I wanted minus the 4X4..The right tires and chaining up is not very often..
Tires and the driver is everything in the snow SRW or DRW..