I know you guys are into small, light and horizontally opposed.
So I present, the Haflinger 4x4
Built for the Austrian army it weighs 1300 lbs, can carry 1100 lbs and features a rear mounted air cooled flat 2 643cc engine, 4 wheel drive, fully independent suspension with 9.8 inches of travel and portal axles with lockers front and rear.
Pretty much the neatest thing ever? maybe. Also, manual transmission.
The company that built it was apparently good enough at 4x4 that when Mercedes wanted a jeep of their own (the G wagon) they had them build it.