Convertible cargo carrier cart system

A receiver hitch cargo carrier comprising:

• a horizontal-receiver;
• a generally rectangular shaped platform;
• a plurality of vertical receivers;
• and a plurality of framework receivers;
• wherein, the horizontal-receiver provides a means to insert and secure the receiver hitch cargo carrier into a vehicle receiver hitch tube, and wherein, the horizontal-receiver serves as a receiver tube for a handle accessory of the receiver hitch cargo carrier when used as a cart system, wherein, the rectangular shaped platform has a top (upper) side and a bottom (under) side;
• the platform also having a front side, a rear side, a left side, and a right side (four perimeter sides), wherein the four perimeter sides of the platform are comprised of stock flat-bar material pieces that are equal in length to the respective side of the platform and equal in height to the height of the platform and;
• wherein, the platform's upper side is comprised of a plurality of channel members, wherein each channel member having an upper side (flat surface) and an under-side (channel shape), wherein the horizontal-receiver tube is positioned below and adjacent to the under-side edges of the platform's channel members in such position that the overall height of the receiver hitch cargo carrier is neither increased nor decreased by the combined height of the platform and the horizontal-receiver tube;
• and wherein the plurality of framework receivers are affixed to the under-side of the platform's channel members, wherein each of the framework receivers serves as a socket that allows the user to attach accessories onto the underside of the platform;
• and wherein each vertical-receiver has a bottom opening and an opposing top opening, four interior sides, and four exterior sides, wherein the vertical receivers are joined in such fashion that any two vertical receivers share a common divider (one interior side of a first vertical-receiver is the exterior side of a second vertical-receiver and the opposing exterior side of the second vertical-receiver is the interior side of a third vertical-receiver, and subsequent vertical receivers combine in similar fashion to form a row of vertical receivers), wherein a row of vertical receivers may be affixed to one or more perimeter sides of the cargo carrier in such position that the bottom edge of the vertical receivers and the bottom of the platform are generally on an equal horizontal plane and, wherein the top edge of the vertical receivers and the top of the platform are generally on an equal horizontal plane such that the overall height of the receiver hitch cargo carrier is neither increased nor decreased by the combined height of the platform and the vertical receivers, wherein the horizontal-receiver extends rearward within the framework of the platform (on the underside) to a length that is approximately three inches short of reaching the platform's rear-side, wherein a void space below the under-side of the rear channel member is intended for storage of a foot component when the receiver hitch cargo carrier is combined with a leg/foot accessory installed into the platform's framework receivers and pivoted to a stowed position.