UK Truck Simulator Demo!
Truck simulator! My prayers were somehow answered by the divine forces of actually bothering to look something up after I asked what was basically a rhetorical question... but, yes: UK Truck Simulator has a demo. It's new! Sadly only a one hour trial, but you should be able to trundle happily around a miniaturised version of Britain for the entire hour. (Pictured: Dover Castle, a Medieval edifice which delivered a strange anecdote about Mel Gibson into my youth. I'll tell you about it sometime.)
So yes, where's my MMO that's basically Eve but with maybe jetpack ninjas versus the titans from Warhammer 40k and some really good emergent strategic stuff, eh? (/Googles)