Will fit short bed with hardware installed under the bed of the pickup?
Depends on whether your truck bed has puck receivers, otherwise you need to install under the bed mount https://www.demco-products.com/rv-to...nder-bed-mount ? I have installed both.
Moride Pin Box capture plate comes with the hitch.
A locking plate is required with one of the following suspension pin boxes: Demco Glide Ride, MorRyde, RotoFlex, Trailair Tri Glide, Trailair Flexair or 5th Airborne per the link above.