I've heard of people just strapping them to a pallet and shipping them through a commercial shipping company. I don't know if I would do it to a ski I didn't want getting scratched up but if it is an old race boat or something it would work.
I'd hit up one of the boat transport guys that post on here...I imagine they'll be dragging something back that way from DS and might be able to throw it in the back of the truck
Go to the National powersports auction page. This is a dealer auction site but I think you can see the sponsored shippers. Their shippers ship hundreds of motorcycles, Sxs and jet skis a month. They have delivered quads and bikes for me from CA to AZ. Each one is independent, but used extensively let me know if you can’t see the shippers. Get insurance just in case they are only as good as the guy handling the ski