another Burly product, the Flatbed, is what I own. adding a big dry bag,
like an Ortlieb rack pack, which has a roll closure on the side, top when laid down,
would be good.. or a portage pack, thats a big dry bag with backpack straps.

making wearing the trailer , to surmount stairs ,etc. possible.. only
having the unlaiden bike to deal with,
in your hands..

Mine came from the self employed Co Op*, bankruptcy ended that , now they're made overseas.
*20" wheels , standard front Hubs.. QR.