stop brace 131 a leading end cap 132 a trailing stop brace 135 and a trailing end cap 136 however the wheel chock 100 includes a trailing elbow 134 in place of the t extension 33 of the wheel chock 10 the trailing elbow 134 generally is coupled to the trailing stop brace 135 and is affixed to a slotted connector outer sleeve 141 fig7 and 8 show a locking sub assembly 120 that generally includes a slotted housing 140 and a pegged housing 150 slidingly coupled together under the biasing influence of a tension element not shown the slotted housing 140 includes an end cap attached to trailing elbow 134 of the trailing stop brace 135 and or outer sleeve 142 having a slotted wall 143 pegged housing 150 includes an inner sleeve 151 having a side wall 152 and an end wall member 153 attached to leading elbow 131 the pegged housing 150 also includes an anti rotation pin 154 mounted at an intermediate point along side wall 152 as an additional safety precaution wheel chock 10 wheel chock 100 or wheel chock 210 also can be augmented through the positioning of a wedge shaped blocker 11 over the leading stop brace and trailing stop brace as shown in a detailed view in fig9 the wedge shaped blocker assembly generally is a substantially triangularly or wedge shaped block that includes a hole 12 which permits attachment to either the leading stop brace or trailing stop brace other shapes or configurations.