Maybe it's different for me since I learned to drive in winter with RWD trucks and gravel roads, so I understand how to control them. Most 4x4s end up in the ditch because they get over confident and don't understand that 4 wheel drive gets you moving easier, but doesn't help in braking. When I want to play, I use RWD so I can drift and slide around more. I drove my 320 rwhp Dakota R/T through winter without issues and only added 75lbs of sand in bed. But I did have snow tires on it.In my experience, (30+ Canadian winters) the guys in the ditch were the ones running in 4wd. Not saying you can't or shouldn't do it, I was just always more comfortable in 2wd where you could drift a bit and play the corners. It would also depend on your winter. If I only encountered snow for a week or two, I wouldn't run weight either. If you get winter for 5+ months then you may want to save some wear and tear on your drivetrain. Also, tires have come a long way from what they were even 10 years ago.
I grew up and learned to drive on 35 miles of nasty back country gravel roads with switch backs and really steep grades, 1000ft drop offs to the Fraser river and it was sometimes days before it would get plowed out. I found I had way more control in 2wd and you respected the conditions more. If you got into trouble, you grabbed 4wd for short bursts. If you were driving in 4wd full time, you were usually over driving to a point that there is no recovery when things got really hairy. Money was tight back then too so we never owned a 4wd. We learned how to chain up at a very young age.
I can remember sitting on the hood of my mom's car for extra weight over the front tires and taking runs at the ice covered road pictured below. The grade alone was brutal in icy conditions much less the two 90 deg turns.
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Have to be carefule adding weight in bed though. There's a balance between enough weight to help with traction, and too much weight where it's hard to recover once the *** end starts to come around