and the like in connection with the recitation of claim elements or the use of a u201c negative u201d limitation as will be apparent to those of skill in the art upon reading this disclosure each of the individual embodiments described and illustrated herein has discrete components and features which may be readily separated from or combined with the features of any of the other several embodiments without departing from the scope or spirit of the present invention referring to fig1 a cap 10 has a top plate 20 and tubular member 30 top plate 20 can be substantially circular rectangular or square tubular member 30 can be substantially circular rectangular or square cap 10 is made of material such 33 cast iron steel high strength aluminum high strength plastic that can sustain vehicular weight such as 4 axle trucks 6 axle trailer or bulldozer top plate 30 is attached to tubular member 30 by methods known to the person having the skill of art such as welding screwing bolting adhesion or forging ways top plate 20 and tubular member 30 can be different materials however it is also understood that even though the cap comprises two parts top plate 20 and tubular member 30 the cap can be made with one piece such as casting or molding referring to fig2 one embodiment of a cap 10 shows a top plate 20 having an upper side 22 and bottom side 24 a tubular member 30 having a top edge 32 a tubular body 34 and bottom edge 36 where.