Linking cargo sleds behind Snowdog?

[wiperhunter2]

I know that there are several Snowdog owners on this forum and I would like your opinions on how is the best way to link cargo sleds behind the Snowdog sled. I am concerned about them sliding out of control while going down ramps and banks. It would not be good to have them pass me on the way down the ramp. Do you use a solid(ie. conduit) v shape hitch or just use rope? Would it apply to adding on a third sled?

I use a tow bar like the ones that Bob posted a link to but I built mine out of metal conduit for a fraction of the price of buying one prebuilt. I use mine on a ATV but the the connection could be easily modified to be used on a snowdog.