HI !!. As far as I know , there are some LPG petrol stations in Madrid , and a few in Sevilla , where some of the city-taxis run on LPG.
Having said that , you can run your LPG vehicle on propane/butane so actually fitting any gas-cooking gas bottle would do the trick. But I find it extremely unsuitable for Moroccan /African trips. And ITs probbably gonna cost more than a diesel.let alone the hassle of bargaining every refuelling (no fixed prices as in petrol) and being constanly worried about gas availability- or carry insane amounts of gas cilinders.
Can not see the point on using LPG in Africa, really.