I've got a Vauxhall combo, I put a steel wardrobe hanging bar across the back of the van about 18" inside the back doors that's covered in pipe lagging and my WFPs and vac tubes lay on that, with their other ends resting on the shelf above the front seats.
A couple of bungee straps hold the vac tubes in place and stop them rattling about. The flexible hose is coiled up along the side of the tank.
Works for me!
Dave