Bridgestone Blizzaks are considered the best choice by many for a winter tire.
The Blizzak DM-V2 gets good reviews and comes in 18" and 20" sizes. The DM-V2 is a good choice for a 1/2 ton truck.
For those who use their 1/2 ton Lightning like its a 3/4 ton, there is also the relatively new Blizzak-LT model, but they have many poor reviews for longevity. If you get some 17" rims, you can also look at the older Blizzak W965 Light Truck model which have more typical amount of complaints about poor longevity that all snow tires suffer from.
The Blizzak DM-V2 gets good reviews and comes in 18" and 20" sizes. The DM-V2 is a good choice for a 1/2 ton truck.
For those who use their 1/2 ton Lightning like its a 3/4 ton, there is also the relatively new Blizzak-LT model, but they have many poor reviews for longevity. If you get some 17" rims, you can also look at the older Blizzak W965 Light Truck model which have more typical amount of complaints about poor longevity that all snow tires suffer from.