hi lee i only rig mine up in the winter months.L5 heater and 13kg gas bottle.
i swap reels and hose for hot water too
cheap claber reel for cold water in spring/ summer
redashe reel and thermobore plus for hot in autumn/winter
as for being safe as long as the gas regulator is on tight and bottle secured and either fit a flue for fumes or leave a van door open i think its safe.
