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As Billy says, why not go for Propane.  It will work all year round.

Your caravan will need a gas regulator which attaches to the bottle ( later caravans have the regulator fixed to the caravan bulkhead ) and delivers the gas at the correct pressure for you appliances.   Propane and Butane regulators each have different fittings and so the cylinders are not readily interchangeable.  If you use both you will need a regulator for each type of cylinder.  They are quite cheap but can be fiddly to change especially when your breakfast is half cooked and it is pouring with rain!

You can buy a device which will allow you to connect two cylinders at the same time and when one runs out it is a simple turn of a knob to change over to the other.

And, yes, it usually best to keep the weight down if you can although the nose weight of the caravan will be governed by how it is loaded not just by the weight of the gas.

DaveS1