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I remember seeing an article in a very old copy of 'Sky and Telescope' (US ed.) regarding the rigidity of two "pole" elements when clamped in various ways.
It was this article that convinced me in adopting the design I used.
Thing is, the larger the scope gets, the larger the pole members need to be to securely deal with being pushed and pulled in azimuth. Also, the higher in altitude you're looking, the greater the force needed the move the bugger, creating problems in alignment. The site I noted below shows how the this bloke sured up the poles to deal with this.
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