Hey Ernie
My LPG tank (120 ltrs) is installed in the trunk. You do lose space. I'm gonna install a gobi roof rack for my spare tire. Now, I keep my spare in the company.
Here's some pics. It runs GREAT, you cannot feel you're running on regular gas or lpg. Even while driving, I can just switch from LPG to regulare or vice versa. But, have the installment done by a professional, 'cause there are a lot of "frauds" out there and I heard that a LPG installation, which isn't installed correct, is an expensive nightmare !
this is the button near the steering wheel to switch from lpg to regular gas and to see how much is left in the lpg tank
and the place where to put the lpg in :
Frenzy