I have used the mountain smith sled, Chariot with skies, Modified a Burley for skies, and used one other polk. They all work fine. I own the chariot and use it as a bike trailer, stroller, and ski rig. It is not cheap. Wait let me rephrase it is expensive, but having three kids from 10 months to 6 years I use it 3 days a week and the helps me get out. If you have a bike trailer putting skies on is not hard but you will not switch back and forth. The Chariot takes one minute to switch. It shines on track but I have taken it lots of places. The only thing I don't love is that all the weight rests on the harness because the skies clip into the wheel holes and the weight falls forward. The burley I put skies on held it self up but tipped with the terrain. I liked the ski models because the drug less and dealt with uneven terrain better. If going for the untracked pow pow I imagine the sled models would be better but on snow mobile trails, having less contact with the trail better.
friend of the fork, knife, and spoon