Chris I've been trying to sort out a torrodial lpg tank for my estate as I'm waiting for a front end kit via Lazydocker's contact,been useing Kevin's link (reply156) and was surprised to find what I think you were looking for ie a vertical mounted torrodial tank it's 'Product range No is V12' on the website hope this info helps. I'm wanting one for the spare wheel well and thinking of raising the floor useing a fairly dense polystyrene to gain more capacity
My plan was to make a full size "platform" from ply wood and baton, then carpet it so it could be lifted in and out if required. Would have thought polystyrene would break up over time :-/ :-/
Not had an email with prices but, to be fair, the kit is vehicle specific as I have specified a few things that aren't normally in his kits and I know he had to check a few suppliers for the reducers to give a couple of options
I'll be calling him tomorrow as Monday is always a nightmare for him