Abstract: A stroller includes a front frame member assembly supporting laterally spaced apart front wheels, a middle frame member assembly supporting laterally spaced apart rear wheels; laterally spaced apart hubs interconnecting the frame member assemblies, and a seat assembly. The hubs each have a mounting structure that comprises a shaft extending from the respective hub. The shafts are axially aligned one with the other, each having two parallel flat sides and two curved sides joining the flat sides. The seat assembly comprises at least one seat frame member, and connector assemblies disposed on opposite sides of the seat frame member. Each connector assembly comprises a mounting surface having a recessed slot defined therein, each slot having a narrow portion disposed between two relatively wider portions. The narrow portion corresponds approximately to the distance between the flat sides.

Abstract: A stroller includes a front frame member assembly supporting laterally spaced apart front wheels, a middle frame member assembly supporting laterally spaced apart rear wheels; laterally spaced apart hubs interconnecting the frame member assemblies, and a seat assembly. The hubs each have a mounting structure that comprises a shaft extending from the respective hub. The shafts are axially aligned one with the other, each having two parallel flat sides and two curved sides joining the flat sides. The seat assembly comprises at least one seat frame member, and connector assemblies disposed on opposite sides of the seat frame member. Each connector assembly comprises a mounting surface having a recessed slot defined therein, each slot having a narrow portion disposed between two relatively wider portions. The narrow portion corresponds approximately to the distance between the flat sides.

Abstract: A trailer hitch coupling unit has a hitch pin assembly mounted on a trailer and a hitch receiver assembly mounted on a vehicle. The hitch pin assembly has a mounting plate and a platform forming a ball and socket joint therebetween, rotatably coupling the platform to the mounting plate. A bull nose, having a groove, projects from the bed plate. A first electrical connector is mounted in an axially extending bore in the bull nose. The hitch receiver assembly has a bed plate configured to be mounted on a bed of the vehicle above a rear axle thereof. The bed plate has a first opening configured to receive the bull nose. A locking plate is mounted on the bed plate for axial movement between a hitch pin receiving position adjacent the bed plate, and a hitch locking position spaced from the bed plate. The locking plate has a second opening configured to receive the bull nose. An actuator is operably connected to the locking plate for effecting the axial movement.