buy 10mtrs of 8? mm bungee and just thread it through ,we did and it works great .the old stuff had lost its springyness and stretched to twice its length.
anything over 5mm should be fine ,do make sure you lace it from the front then it takes a little while to get the taughtness just right only thencut off any not needed.
we put a couple of new hooks in the back door as the original set up put pressure on the numberplate light it also stops it rattling
We are also looking to replace our cord and also the hooks on the side of the trailer can anyone help with the hooks ie where to buy and how to fit ,thanks.