I looked at the underslung LPG option when specifying our conversion. Seemed a convenient and cheap way of obtaining gas. However, the declining availability of LPG in the UK and stories I also read about complications in France, put me off a bit. So I ended up keeping it simple and sticking with the Camping Gaz 907 cylinder. I know the gas itself is pricier but it’s available everywhere we are likely to need it and a fair number of canisters will be required before I reach the price of installing the underslung LPG tank.