Apologies for the delay, Nick. This is simply a way of holding anything down to the deck. I used it, long term, for seats and a fuel tank and generally for jerry cans, water bottles, a folded dinghy, fish box full of ropes, and various other items. It works well and I've used it for a good number of years without a problem.
The aluminium track is marine quality and anodised. It's original function is the base of a rubbing strake for a hard boat where a rubber insert slides into the slot. The wee brackets you'll have to make yourself. The track was sourced from Wilks.
I hope this is of some interest.