The difference between an automotive tank and a camper tank is simply the position of the gas take off pipe.
I've seen motorhomes fitted with 4 hole tanks and two take off pipes, one for the engine, and one for the cooker.
In an automotive tank the takeoff pipe takes liquid from the bottom of the tank. In a camper tank, the takeoff pipe takes vapour from the top of the tank. There also needs to be some extra apparatus to trap any liquid coming out of the pipe if the tank is shaken around, and a pressure regulator (which is probably what you are referring to as a vaporizer).
If the Volvo tank is a single hole tank, then you're stuffed, as I don't think you'll find a multivalve with a vapour take off.
If you're reusing an old tank (over 10 years old), then it will need to be inspected and pressure tested with a certificate to prove this, or you'll invalidate the insurance on your motorhome.
By the time you've found someone to do this, and then bought the new valves and fittings for vapour take off, you'll have spent most of the cost of a new tank. So it's only a job to consider for the people who are terminally cheap, or don't care about the safety of themselves and/or others.
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