On our previous MH we had Conrad Anderson fit a (I think) 60litre underslung tank and it was brilliant - stowed the generator in the gas locker. Unfortunately there's not sufficient room underneath to fit a similar tank on our current van so we went for the 2 x 11kg Alugas cylinders fitted by...
We have requested a booking from 13th. May to 22nd. It's under the name of Pat & John Anderson (didn't put JayDee on form :doh:), so if they ask if you know us you can say no, but....
Looking forward to it.
Here is a link to a map that shows air rifle clubs in UK and Europe.