Motorhomes vary radically in size, design and the manner in which they are used, so it's seldom possible to provide a black-or-white answer as the gas arrangements that may be great for UK touring may be hopeless if your motorcaravanning is primarily in Europe or vice versa. (For convenience, I shall use the words "Europe" and "European" to relate to European countries outside the UK.)
The first (and perhaps most important) thing to bear in mind is that UK 'exchange-only' gas-bottles (such as Calor containers) are not exchangeable outside this country. So what can UK motorcaravanners do about gas during extended trips in Europe? There are several options.