It depends on what unplanned body modifications one is willing to deal with. Now if one really wants to get into some gnarly stuff an early generation Wrangler, Pre 77 Bronco, CJ 5, Two door Signet with 411 gears, Posi, Snow chains and a block and tackle, home made LT front suspension, a 727 torque flight with a 273 commando HO driving this whole concoction...
Or the 1974 RamCharger with a 440, welded front gears, Posi in the rear 411's front and rear, warn hubs and a part time conversion and some super unique mother nature formed body work, add a 10K winch and then lets talk about fun.