Siping does alot for grip and keeping the tires clear of snow. You should also clean your tires, put some oilcleaner on the tread and pressure wash it to dissolve any tar and oil that stick to your tire. You can then spray some oilcleaner on the tread maybe twice a month and just drive the truck.
You can get old balancing weights from tire shops, theyŽll probably giveŽem to you. Put those in a bucket or ammo box and secure them in your bed, preferably right up against the tailgate. My boss has a 2 motoroil jugs full of weights, one on each side. His 2500 Cummins handles nicely. This takes less room than a sandbag and there is no risk of having a torn sandbag in the bed.
I have studded and siped 33x12.5 R15 MT-Rs, SFA and alot of crap in the bed. Mine does great in snow and ice. I always have some oilcleaner in a refillable spraycan, so I can clean anytime I think I need it.
