Portable advertising platform systems

A modular and portable advertising platform system to support indicia-bearing media, retail products, mechanical devices and other items with the platform system comprising:

• a generally rectangular cart comprising a front, a rear, opposite sides, a plurality of vertical mounts, a plurality of horizontal brace members, and a plurality of first horizontal insert tubes that telescopically attach to each horizontal brace member so that the cart is adjustable both in width and in length, wherein ends of corresponding first horizontal insert tubes slide inside corresponding first interconnecting joints that are attached to corresponding vertical mounts;
• detachable wheel assemblies that are telescopically coupled to corresponding vertical mounts at four corners of the cart to level the cart in preparation for rolling and wherein each wheel assembly can be optionally replaced with a smaller wheel for indoor use and a larger wheel for rough terrain;
• leg levelers coupled to corresponding horizontal brace members at a front end and a rear end of the cart respectively, wherein each leg leveler comprises a first vertical insert tube, a second horizontal insert tube, and a second interconnecting joint, wherein the leg levelers are slidably adjustable both vertically and horizontally to level the platform system on an uneven ground surface and wherein by using friction with the ground surface can provide a durable brake mechanism after the wheels assemblies are lifted off the ground surface, wherein the leg levelers extend beyond the front end and the rear end of the cart;
• and
• at least one upper web comprising a plurality vertical brace members, a plurality of second vertical insert tubes telescopically attached to the plurality of vertical brace members, multiple tiers of horizontally telescopic overhanging arms that extend beyond each side of the cart, and a plurality of third interconnecting joints, wherein the horizontally telescopic overhanging arms are constructed from tubes which provide the mounting sites for the indicia-bearing media, retail products and mechanical devices, and wherein each upper web is vertically adjustable by the vertical brace members, the second vertical insert tubes, and the third interconnecting joints which are interconnected;
• and each upper web is horizontally adjustable by the telescopic overhanging arms that are attached to the third interconnecting joints.