LPG removal

[bimmer49]

My V40 BiFuel is nearing it's economical life end.
It needs and engine (burning oil) and the gearbox has a constant grumble (final drive bearings) and the ITV (MOT) is due.
Now I have a Motorhome under renovation (diesel) but has Propane/Butane gas bottles on board.
I was considering removing the tank and filler from the V40 and maybe bolting it to the underside of the MH and doing away with the bottles and then i can refill the tank on the road, saving a bob or two. My gas bottles aren't interchangeable outside of Spain and Portugal, whereas top up available anywhere.
Technically I can do it, my Vehicle Technical card (Fiche Tecnica) say I have gas supply on board but doesn't specify where or for what for.
My question is: In the tank mounted control box, does that reduce the liquid to a gas before it gets to the gizmo with the stepper motor mounted on it (gas distributor?) or is it liquid up to the distributor?
If it's gas from the tank then i'm onto a winner.
Looking at UTube for LPG fitments they all use oblong tank kits with additional gas valve to produce the gas from the liquid. Is the VOLVO one "built in"?
Just an idea......cos the car will probably go for scrap.
PS: Is it worth nicking the gas gauge out of the dash too?