Thanks Bogger.
Its a bit of a mystery how the bloddy thing functions thats for sure. I have tried several ways to set up the net and attached it to the bungee cord. At first I threaded the cord on the outer two edges and clamped the netting over the cord this matde the net square and hold shape but when I rotated the front bar to simulate the turning of the vehicle the netting bunched. Next I swapped the cord for clothes line plastic rapt cord $5 for 30 mtres and then attached the bungee cord to the two outer edges using zip ties.I used snap hooks to fasten each end of the cord to the bottom of the camper and the front cross bar.. result was that the netting still bunched but not nearly as bad as before.. to me it looked as if the camper end of the netting needs to be attached in a fixed position and only the cord attached at the tow ball cross bar end allowed to stretch when the vehicle turns.. result..looked a lot better but it still made the netting bunch at the leading edge nearest the bar up to about a third of the way down the net and left a 12 to 15 inch gap between the edge of the net and the tow ball cross bar when return to nuetral position.
By this time it was late afternoon and I was feeling like crap yester day, so I packed up and left it over night.
Im pretty sure what works is running the cord through loops attached to the netting, on both outer edges and down the side of the netting about 15 inches inside the outer edge.
Down the centre of the net in line with the tow ball and the center of the camper it does not matter so much to have movement, in fact I think the less movement towards the center of the netting in line with the tow ball helps keep the netting in place i.e its the pivot point around which the center of the netting turns. So havings minimal stretch there is probably something to aim for.
Here is a few pics of different aspects of the net.
This is netvfrom the camper towards the draw bar with the net (ground looking up) underneath view.
Side view showing outer edge
Front of the net with the draw bar cut out. I think I need to experiment ways to attach the section to the cross bar
Camper end corner of net.
Cross bar end corner of the net.
I think if I can get the two side edges functioning properly and the center of the net to keep an equie distance to the cross bar through a full range of motion during turning, then I might be a whole lot closer to solving the cunundrum
Will try and set it up again this afternoon and try out a few different configurations to see what works best..