an elastameric block 36 and having an elastameric connecting flange 38 the flange 38 is configured to fit the end opening of tubes 16 18 a pin or bolt 40 extends through a hole in the tube end and through an aligned hole 42 in the flange 38 for securing the bar end 26 to the tube end fig3 b illustrates the reaction of the bar end 26 to forced engagement of cargo bar 10 with walls 12 and 14 whereas the entire bar end 26 will collapse or compress to some degree the smaller sections of the segments will at least initially bear the brunt of the compression note that nodules 34 are visibly compressed and hole 42 is visibly elongated i e flange 38 is forced further into the tube end this activity occurs when a wall structure 12 14 has a greater resistance to the engaging force c then does the elastameric resistance of the bar end 28 from the above it will be appreciated that the bar end 26 and the design of the bar end both structural design and durometer of the elastamer can be varied to produce greater or lesser force absorption as compared to the resistive force of the walls 12 14 an example of such design modification structurally is illustrated in fig4 note that as compared to the design of fig3 the flange 38 includes a shoulder.