Hi,
I got a LPG in my H2. The price to install it is quite high but it's realy worth it.
This is picture of a tank in my back of the car. I can drive up to 800KM with 200L of LPG.
BTW the reflecting plates are already removed. But we have to got them here in belgium when you go to the car control check.
You will be able to find a LPG installation for your H2 at
http://www.auto-techno.be he's also doing repair work and maintenance of my H2.