ordered on a sunday, received friday morning. a nice piece of work!
the tray portion can seat a pair of 12-volt 18 Amp-hour lead-acid batteries if one is so inclined although 14-16 Ah would probably be the perfect fit. folks interested in riding at night would have no problem powering 12-volt motorcycle lights and turn signals with a gel-cell or two.
on a rover, might be easiest to install the forward bracket snug against the chainstay weld for a trial fit of the rack. it rides a bit low for my taste - i have to plow through standing water when it gets serious rainy here. the nexus-8 keeps the chain 8 inches above the road surface and if one were to mount the low-rider upside down, so would its load.
as it turns out, a terratrike grocery pannier hung at the top of the inverted rack will have same clearance as if mounted on the standard cargo rack. the shelf can serve as a fairly secure area for toting a tool pouch and pump or tool box. if using both inverted low-rider and cargo rack you can tote 4 grocery panniers above axle height - significantly cheaper than going the cargo monster route or hauling a trailer.
despite the disclaimer, looks like derailleur users will not have a chainline problem with the inverted rack. will have the rover configured as an x-8 in a few days for road testing. will be installing 1/4 threaded rod in the front and rear of the low-rider frame to stiffen the side rails.
terratrike done good with this jewel.