There is an episode of Roadkill Garage on Motor Trend where they built up a junky old Challenger for off-roading. IIRC they didn't heavily modify the suspension/subframe so much as hack the fenders for huge tires, I think they were at least 35"?
I totally get the "overlanding RWD car" I have taken my Duster on some dirt mountain roads and it's fun as heck, and I still have a '93 XJ Cherokee I take wheeling every now and then. An old car just has a different feel to it off-road compared to a truck or SUV, my Jeep only feels "thrilling" when I'm crawling up a rocky hill in low range at a 30-degree-plus angle. Anything less it laughs off.
I would love to build more of a rally-inspired off-roader like this...
