I would recomend the Otter fish huts in the Cabin size for two people.
I log alot of days on the ice in the winter and for towing and quality you cant beat a OTTER.
The clam products are nice but the sleigh is lacking if you are towing any great distances the clam hook up will eventualy fail.
The otter sleigh is designed as a sleigh to be towed behind a a snowmobile or ATV.
The clam is a sleigh that has a after the fact piece to attach the tow bar to the seigh while the otter comes with it built into the sleigh which results in greater durability.
The quality of the plastic overal in the sleigh is by far better in the otter I have seen alot of patch jobs on the clam but not the otter.
You will pay a bit more for the otter but in the long run it is well worth it.
I will recomend putting pipe insulation on the frame for the hut as this will prevent pinching of the fabric on long hauls and prolong the life of the whole unit.
They do cost more but in todays world you get what you pay for.
hope this helps.
Buckshot.
Check out the site
http://www.otteroutdoors.com/