Sorry that I have not replied sooner, but isn’t it Murphy’s Law that says when you buy something useful the opportunity of using it gets delayed??? In this case each pitch on the 3 sites we have visited were as level as pond water so our lock-n-level stayed in its bag. Finally got to use it on site at Whitby and what a departure from our levelling ramp (which may well end up at a charity shop). Sorted out the orientation of the caravan to suit ‘er-indoors, did as instructed with lock-n-level, Al-Ko lock on, started up car pump, and watched the spirit level. Job done, van spot on level, and was still spot on level 2 weeks later. Life can’t get better than that!!! Well done Terry and Derek.