This is a Rheinmetall Land-Wasser-Schlepper (1939-42), a mixture between a tracked tractor and a tug boat. Designed by Rheinstahl 21 examples were produced at the Boitzenburger Binnenwerf Gebrüder Sachsenberg -- a shipyard! The running gear came from Alkett.
Vauxhall Churchill IV
Wolfenstein: Enemy Territory (2003)
This is a Vauxhall Infantry Tank Mk.IV Churchill AVRE with a Petard 290 mm spigot mortar. Vauxhall developed the tank in quite a rush and first tanks were ready by 1941. It was produced in large numbers by a number of companies until 1945. The pioneer AVRE version became available in 1944.
MAN 630 L2AE
Runabout 2 (1999)
This is supposed to be an MAN 630 L2AE 5t gl (1958-72).