Fair comment Troy, they can be cranked up very tightly. The Flash is pretty light weight.
Jeff
Yeah, we have a few on the floor atm and had a good look at them, no way I'd be comfortable barrelling down some techy single with downward forces on the seatstay.
Not even sure how a BOB or Extrawheel would go, with the torsional forces they apply to the rear triangle, as the Flash is more of a race frame weight with tubing thickness. I tow my Ibex on a few bikes, super flexy on my old VT dually, moderate on my alloy frames, super stiff on my old steel '88 GT karakoram.
You could use a tandem BOB skewer with a few spacers to get the mount out past the frame dropout.
But I reckon the best option is go lighter with gear (if possible with time and budget contraints) and utilise framebag, seatbag, backpack and handlebar harness system.