When wintering in Norway found that we had to ditch butane as that froze up, but never had any freezing issues with propane and just carted the bottle along to a filling station and watched them do the rest......all done by weight on scales connected to a stop valve in the supply,all seemed a bit crude but it worked!.....The gas bottle locker holds a Honda 2kva genny with a tad of space to spare,and as the spare now sits ahead of the engine it should balance the weight of the gas cylinder aft of the back axle......well that's the plan anyway !..