I have been using gas caddies for years now but only gravity feed. There is a real possiblity of static electricty in a very low humidity area. You would have fumes and a source if spark. I would not want to have any electrical anything around.
Other than that, they work great. I use a 3/4 clear hose on the bottom valve and drop it down the fuel fill as low as possible. Maybe you can build a small ramp to roll it up on to to give you the height you need. It will empty it in about 10 minutes.
Good luck, and I think gas caddies will be in wide use if there is a big price difference. I figured the break even point is about .75 a gallon.