Trailer Jack Auto Dolly Attachment ramps The source lists the lock

The source lists the lock or brake configuration as Dual Pedal Brake

200 lbs Material Non-Telescoping Model / MPN 272463 Dimensions 27"W x 44

Walk you bike on with ease

Confirm model or manufacturer part number 649-29637-1

and other secured personal items

Trailer Jack Auto Dolly Attachment ramps The source lists the lockProduct Overview The Trailer Jack Dolly provides a "capture" for your trailer jack or trailer jack wheel. With a pair of Auto Dollies under each trailer wheel and one with the Trailer Jack Attachment under the jack, your trailer (and load) can now be moved in any direction (even sideways). Preserve precious floor space by storing it closer to the wall than you could hope to safely & conveniently get it by jockeying it around on your hitch! *Auto dolly