I have several sleds of this type:
Koenders
They come in different sizes--I have a small one that I use to haul the water out in winter (barrels of water ride nicely in it!) and a couple that we use for hauling hay out to the pastures--I use those all year for that purpose, they slide well on grass and are much more convenient than using a wheelbarrow.
I have a larger one that I haul manure with in winter--I either pull it myself or hitch a mini to it (stone boat style, no shafts) --loaded it doesn't run up on him. Empty, I have to be careful, because it certainly will run up then.
There are bigger sleds made to pull behind a snowmobile; they come with towing hardware and I've thought that it would be easy to convert that to shafts--would just be a matter of getting a set of shafts made for it as the mounting holes are already there. I haven't bothered to do it because I just am not that interested in winter sledding when we get so little suitable snow cover (it's either too deep, or non-existant, or too crusted over and is seldom suitable footing for a little horse to pull a sled "for fun" and if the snow is just right there's a good chance the weather is just too cold! I don't enjoy sledding when it is 40 below!
Those plastic calf & chore sleds are just the best invention ever!
Oh, and if you're going to use one of those sleds as a sleigh, don't sit down in the sled, put a straw bale in the sled & sit on that--it raises you up a bit & is much more comfortable!