BenK has got it right. After 30 years in the oilfield mud, sand, ice and snow. I agree with him, it depends. Also the type of ruts if any, and may heaven help you if they used rounded pea gravel on the road. And, is there a dozer or tow truck handy, when you make a mistake.
I have found 4wd and single rears to be the best. Dual rears with 4wd are not bad. Tandems with inter axel locks next (they seem to tear up easy) then single axel duals are the weakest. Lockers really help. By the way, with practice, and working in two man teams, you would be surprised just how quickly you can chain up for bad roads. Say 20 minutes to put on your coveralls, chain up, then strip off your coveralls and have a cup of coffee. I think non 4wd tucks should always have chains, and I often have chains for all four wheels when needed.
Planning is best, and a good pair of well broken in boots, is a good emergency reserve.