Hi again and thanks for the feedback. It's the 12 hours stationary part that dissuades me from solar charging - otherwise an excellent solution.
My trailer broke at one stage and I lugged the generator around western Tasmania strapped onto the rear rack, which looked a bit ridiculous! Btw, I often charge to only 85-90% now, since it takes only 3 hours of charging time, as against a further 1h20m for the final 15%.
Yes, the Thule front rack was the touring version with the side frames (necessary for rigidity and load stability). Apart from having to eventually lock-tight all the end screws because they kept on vibrating loose, I had no problems with it (even though with my wide Suntour Aion forks on the Delite it was at the limit of width, I'd say, and looks a bit distorted (twisted) when securely mounted). I only needed to carry light loads in the two front panniers of 4-5kg in each, but could have easily gone to 6-7kg or more. The load does ride a bit high (though I mounted the Ortlieb panniers to the lower side bars of the frames); but steering and ride stability were perfectly fine. My Delite was stolen, along with the Thule rack, and I am now looking to buy a new Thule rack for my new Supercharger. I've already checked with my LBS that it does fit on the Supercharger under the existing R&M rack, no problem.
Regarding rear rack failure: on the Delite I had no problems whatsoever with 17-20kg load and on sometimes difficult terrain (maybe because of the rear suspension?), but the Supercharger rear rack is another matter altogether - I've already had two fail in under 2,500km of use (at the same location - rear strut weld where it attaches to the seat stay, both sides), and now a third one is going the same way too. In my opinion, there is a serious design flaw with the Supercharger rack as supplied, and it makes an otherwise excellent bike not suitable for serious touring. R&M are well aware of my feelings about this, but I have to say they've been fantastic in providing new racks!
