Unfortunately most campsites will not allow a free standing cylinder used externally.Yes it will work ok but you need a different connection to the bottle.
You can buy an adaptor hose that you can connect directly from a remote bottle to your onboard LPG fill point. Check out the gaslow or gasit sites for details
You can also connect a French bottle to your fill point also with the same hose but with French adaptor.
which campsites are they then?Unfortunately most campsites will not allow a free standing cylinder used externally.
Also it’s a high pressure hose connection between the cylinder and the filler point which isn’t a great idea
GOK do make the only kit I have seen to connect an external cylinder to a leisure vehicle as set out in the BSEN1949:2021
External Gas Supply Bottle Back Up / Extend-a-stay with German/butane to UK propane Easy-fit adapter. This system is the only BSEN1949:2011+A1:2013 compliant kit available on the market with its first stage regulator making it far safer than other cylinder connection methods. The external gas...autogasshop.co.uk
Definitely the club sites but most bigger sites that know the gas regulations .which campsites are they then?