Hi Zaphod
This is my take on the same idea.....
IV since added a big old HD's Quick release backrest to the rack.... I used the three pillion fixing points under the seat, but as you can see, iv added two side supports to aid stability. These are slide on. I used two HD’s quick release screen washers as guides on two longer gutter bolts.
I can now either just cargo net stuff to the rack, or as I did last weekend for the Britbutt rally used an Oxford expanding tail pack….
I have fitted the big Givi topbox to it in the past and that worked a treat…. (But I had to take it off, my mate wanted it back… :lol: .). And finally iv an aux tank half finished, that will mount to the rack, with a matching rack built into the top of it.
Well that’s the plan so far….