If you have a few hundred thousand laying around, this 1925 Rolls-Royce Phantom I Maharaja complete with (I can't ID it, the article says a .450 hand cranked machine gun) on a trailer and what look like some Howdah pistols on scissor mounts.
http://www.npr.org/blogs/thetwo-way...rolls-royce-elephant-gun-included?ft=1&f=1001
http://www.npr.org/blogs/thetwo-way...rolls-royce-elephant-gun-included?ft=1&f=1001