The present invention provides an apparatus for supporting stacking of a top heating, ventilation, and air conditioning unit on top of a bottom HVAC unit. The upper layer includes a thin layer of leather material, and the lower layer is a material which can be stretched in two directions. The trailer includes a pair of wheels that have special mounts, allowing the frame to be positioned as close to ground as possible, thus eliminating the need for any pivot members to raise the greens mower as found in the prior art. Then, the ceramic patch antenna is arranged on the radio frequency component testing fixture.