Trying to keep 4runner road worthy:
Turret ideas - bolt it to the top of the 4runner so it can be removed and stowed or trailered. Thats supposing the 4rnr still runs and is roadable.
Gunner windows- will windshield or rear window or headlight wipers work? Never tested or heard if wipers can deal with paint and shell bits.
Then there's this:
just for fun.