Timster, I'm taking the US Import stickers off. They belong to the guy who imported the H2.
Ernie Italy,
the LPG tank is in the trunk. I keep the spare tire in my company. I don't do many kilometres (about 9000 a year), and don't drive far from where I live (so I don't need the spare, and I've got the air compressor that I can use to inflate a tire, if necessary).
I don't know the specific details about the LPG tank yet (since I'll only be getting the truck beginning next week, it still has to go to inspection, get the right insurance, ... the usual paperwork...).
but, I indeed know that you can swich to regular gasoline with just a switch of a button, which is located next to the steering wheel (left side, where you also see how much LPG you have left).
The tank I had in my dodge was the biggest available (over 200 ltrs). Installed that one in the back of my bed (pick up truck, looots of place) check it out :
http://www.dtwtrucks.com/Frenzy
Filip aka Frenzy
Belgium