Tony-
The fiberglass pole pulks I describe at http://www.skipulk.com weigh about 10-11 lbs (6 lbs for the sled, 3 lbs for the poles and 1 lb for the harness.
I disagree with the previous posts about traversing. With good poles and fins (skegs) to keep your load from side slipping it is possible to traverse moderate angle slopes well.
The fins do create a bit of a dilemna- They ad to the control on side hills and downhills but ad a bit of drag on the uphills. Adjustable fins would be best ( I am working on this….) Some of my colleagues use removeable fins.
By crossing your poles it is also posible to track through some pretty dense forests. The crossing delays your pulk long enough that it follows in your tracks instead of short cuttng the corner. There are limitations to tight spaces but there are limitations with a pack as well.
The only times I have felt the pulk creates disadvantages over a pack are:
1. Open stream crossings.
2. Exposed rocky knife edge type ridges
3. Extremely steep snowfields where weight is needed over the skins.
Thanks for the opportunity to ad my comments.