Up here at Chez Ravenfamily, we're too rural to get doorstep recycling collections. But as you've probably noticed, we're big on that environmental gig. So as time goes by, we tend to build up a lot of cans and plastic bottles that need to go to the recycling centre. Here's the dilemma: we've got a load of lightweight stuff to haul, but only one person to do the hauling. We've got two bike trailers, but one person can only pull one trailer -- can't they?
That'd carry a load of recycling all in one go, and only at moderate-to-high risk of injury, failure and horrific expense. Fantastic.
Now you'll note that this puts the twisting load of the rear trailer all on that skinny BOB QR, and that's something which is famous for bending even when properly fitted on a sturdy bike. Okay, so this is for super-light duty work. At least until I come up with something stronger - a properly-machined spacer about 18mm long with an external diameter of 14mm and a bore of 5mm should do the trick.
Luckily the forces on that middle trailer wheel are pretty light: just the pull and jink of the rear trailer. At least, I hope so!
In short, yes it works, and yes it works damn well. The BOB trailer is very good at precisely tracking a bike's path - that's why it is so popular offroad, because you can take a BOB down lumpy, uneven singletrack and as long as your bike goes there, the trailer goes there. The same characteristic makes it great in tight traffic, too, as you can pretty much ride as if it wasn't there and it'll not get hung up on kerbs or vehicles.
It is a little more sketchy than the same weight in just one trailer: that extra trailer puts some entertaining tug-and-jink forces on your backside and lighter riders or whippier towing bikes might find it challenging. But with a light load, it's grand.