How about 'snow tires' on the rear of a pickup?
I had a 4WD Dodge R50 pickup for 16 years and it had "snow tires" (aggressive tread and large) on all four wheels. I now have a 2005 Chevy Colorado 2WD with a automatic locking differential. I figured this could answer my need for traction without having to pay the price in dollars or weight of a 4WD. So far so good, and this weekend we just got through record setting snow in the New York (NJ) area. The Chevy is the basic truck with 205 75R15 (did I get those numbers in the right order? well I'll assume if not, you know what I mean) and an "all weather" street treads all around. Given my drive traction now is limited to the rear wheels (albet it both of them) I'm thinking why not go back to the old practice of putting snow tires (maybe a wider tire? has to have the same diameter if the speedometer is to be accurate, right?) on the rear. I'd just leave them on year round and rotate my existing set of street tires in the front.