I have been pulling a flatbed for about 8 months, and it's taken me almost that long to find a pair of gloves that will stand up to the abuse and weather conditions of this job. I like mechanic style gloves in good weather because they give me the dexterity to wind straps. when the snow started flying, nothing I tried was cutting it. insulated leather gloves were nice until they'd get wet, then they'd dry hard. I finally bit the bullet and spent $30 on a pair of Carhartt insulated waterproof pigskin gloves. been using them about a month, they are taking quite a beating and keep my hands warm and dry. dexterity isn't great due to the insulation, but better than insulated leather gloves.
got them from GEMPLER'S - Official Site - Your Source for Outdoor Work Supplies they also have a couple other styles of gloves that look like they would work for flatbedding.