Slickburban
1/2 ton status
Well I hope this counts as pic here's a link to my 88 Chevy Suburban
http://www.youtube.com/watch?v=vv7r-MP1wsw
http://www.youtube.com/watch?v=vv7r-MP1wsw

I didn't know you have a corvair van. Cool.
It says it right in the name.... SWAMP er, not SNOW er.(Also, super swampers are absolutely useless in the snow, who'd of thought?)

It says it right in the name.... SWAMP er, not SNOW er.
Large, flat tread blocks just float on top of the snow. This makes for very poor grip, especially on iced down or hard packed snow. In addition to that, a wide, oversize tire will also float on top of the snow. Small, pliable tread blocks (like an A/T tire) grip the hardpack snow/ice like a bunch of little fingers providing much better traction and stability. And a thin tire would concentrate the vehicles weight which helps that traction. This is applicaple to daily/street driven vehicles, not those taking their 4x4 off trail through 4' of fresh powder where you want the truck to stay on top.
