Drive safely, arrive safely. There are some basic rules to follow when transporting cylinders:
Check that cylinder valves are properly closed and that valve caps are fitted.
Ventilate your vehicle.
Disconnect regulators, hoses and torches etc.
Secure cylinders properly to prevent them from moving.
Go directly to your destination.
Do not leave cylinders inside the boot or in an unventilated place.
Immediately unload at destinations, or if stopping for a longer time store in a ventilated place.
An industry leading comprehensive guide to gas shielded arc welding and oxy-fuel cutting.