Get a P38 4.6 on LPG.
I have a P38 4.6 Thor, L322 4.2 SC and a Cayenne S on LPG.
Cheap to run, lots of poke, great to tow, reliable when sorted, cheap parts, dont rust very very capable off road. and you can tow a house.
As above if a P38 is on coils, walk away. factor in getting a nanocom...