The Lock 'n Level device I mentioned previously arrived yesterday.
If anyone is thinking of buying one here are a few stats :-
It measures 70cm x 24cms and weighs just short of 2.5Kg.
It comes with its own bag to store it in,an instruction book and two spare valve caps.
Our levelling ramps weigh 3.3Kg so there is a slight weight saving.
We don't use that many unlevel pitches but when we have used it I will report back on the findings.
In case anyone thinks otherwise I have absolutely no connection at all with the manufacturer of the device apart from being a customer.