another vote for LPG here .

I use my ffrr for work, it tows for a living, the other day I used one and a half tanks full of diesel, I can not begin to work out how times I would have had to fill up if it were lpg, possibly 5 times. My time is more important to me than endlessly looking for lpg and filling up. If you could get 150 lts in a ffrr without the loss of load space I might consider one, or if every garage sold lpg, but for now I'm very happy with my 6 pot tractor that has a spare wheel and room in the boot for my toolboxes. Plus it's got bags of low end grunt, just what you need to get 3.5 tons rolling