I could have lived my whole life without knowing this was out there...
Take a super duty truck chassis. Build a state-of-the-art recreational vehicle around it. Add in true off-road capabilities and you've got an RV that can travel pretty much anywhere on the planet. I know there are other companies that make similar vehicles (there's one that does this on the Ford Econoline 4WD model whose name escapes me right now).
It's supremely expensive - the used model in the picture above is selling for over $300K - and uttlerly impractical, for sure. But I tell you this right now: If I were to hit the lottery, you had damn well better believe I'd be placing an order for the biggest model they can make. There's something about that setup that just begs to be taken on a very long road trip - and believe me, if you can afford that rig, you can afford the gas.
So, anyone got a spare $400K they aren't using at the moment?
That is all.