I extended the poles for the just kampers roof bunks with a piece of dowel very sucessfully.
I have a JK bunk for sale if anyone is interested. The poles are long enough to be cut down to go across the cab, you would just need to make up the cab canvas bit (which I'm not sure about how to do)
Jules, I don't know how to make up brackets, my father-in-law knocked some up for me.
thanks for the tip on the canvas - I'll go looking for that myself!
Rupert
www.littleyellowcar.co.uk