Originally Posted by Geoff

As far as I am aware the M.O.T. tester will be looking for proper fitting i.e. mountings fixed to a reasonably strong part of the structure with adequate load spreading plates.

My advise would be to call in and have a word with your tester, if you don't already have a regular one look for a small independant M.O.T. tester, they are generaly more clued up on the unusual. TIP:- Try and sus out who the local traders use.

Regards Geoff

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