The local TR dealer here in town was giving a demo on Tower Road,  an old 
highway used for hillclimbs and rolled a brand new TR6.    The top was up, 
it didn't collapse, they rolled it on its wheels and drove it back to the 
shop.
   I have .125 wall thickness 1-3/4"  tubing in my car for the main double 
paper-clip roll bar. Too heavy in my opinion.  You get strength by having 
more tubes attatching in more places than one big heavy one.
SDSteve
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