Mechta
LPG is a darned site easier to store unless the military HSE gophers get involved. Go to any house, petrol station or even a civvy gliding club that uses it, no bunding or 6 ft protective fences required, doesn't matter if you "spill" some & is perfectly safe to use so long as you take basic precautions. Its cheaper & gives a far better launch that any diesel powered winch - I suspect the engines last longer too rather than the smoky turbo charged diesel versions.
Cheers
R2