Exactly, the SnoBunjii kit!! I have one and it is by far and away the very best thing to tow a sled I have ever seen and I've seen them all. First, it's about the size of a deck of playing cards. Second, you can tow with absolutely no drama whatsoever. I can tow at about 40mph on smooth trails not a single issue at all. We have in fact opted to finish a ride with a dead sled rather than cut it short, simply because of how incredible it is to tow a dead sled. The only disadvantage is that you don't want the rider on the sled at all so someone has to double up. The last thing so great about it was how cheap it was. I think I paid $20, maybe even less. It's so simple and amazing how it works it boggles the mind.
Why this company doesn't make such a thing anymore is beyond me. It is simply the smallest, lightest, easiest, quickest and cheapest way to tow a sled possible. Someone remake this kit!!!