Cargo carriage for a pickup truck

A carriage for retaining cargo in a bed of a vehicle with a tailgate, comprising:

• a tray adapted for retaining the cargo therein;
• a plurality of wheels mounted to the tray and adapted for permitting the carriage to roll along the bed between a stored position within the bed when the tailgate is up and an access position on top of the tailgate when the tailgate is down;
• and
• two or more retainer member assemblies adapted to restrain the tray in the stored position and the access position,
• wherein a first one of the retainer member assemblies comprises an end-positioned retainer assembly having at least one retainer member and a pin that slips through an enlarged hinge gap between the tailgate and the bed when the tailgate is down, wherein the pin does not fit through the hinge gap when the tailgate is up, thereby retaining the carriage in the stored position;
• and
• wherein a second one of the retainer member assemblies comprises a side-mounted retainer member assembly having two or more retainer members that are coupled between the tray and the vehicle, wherein the retainer members have a length such that the retainer members retain the carriage in the access position from moving forward off the tailgate.