steve, you might get a better answer if you frame your questions based on objective.
my exp is the classic sled drag on denali, and imho 80/20 sled/personal.
everything i need for the day in the pack + if you go in a hole you can escape the sled weight(if you go all in) get retrieved or self recover and everything is buttoned up for retrieval.
when you say “pulk” i think stiff hard points more for x-country ski tours,
lots of experience on this site so maybe a better answer is coming your way.
(personally would have hated more hard points in my system like a pulk on the hill, the sled will follow the fall line especially descending 11k to the lz).
w