For starters: The SdKfz_251
From Wiki
The first two models were produced in small numbers. The C variant had a larger production run, but was a quite complex vehicle to build, involving many angled plates that gave reasonable protection from small arms fire. The D version utilized a much simpler design, and can be easily recognised by its single piece sloping rear (with flat doors).Although designed for cross country work, it had some limitations as the front wheels were not powered.
The standard personnel carrier version was equipped with a 7.92 mm MG34 or MG42 machine gun mounted at the front of the open compartment, above and behind the driver. A second machine gun was usually mounted at the rear on an anti-aircraft mount.
These vehicles were meant to enable panzergrenadiers to accompany panzers and provide infantry support as required. In practice, there were never enough of them to go around, and many panzergrenadier units had to make do with trucks for transport. Only a very few favored divisions like Panzer Lehr received enough to fully equip their infantry units.
Variants were produced for specialized purposes, including with anti-aircraft guns, light howitzers , anti tank guns and mortars or even large unguided artillery rockets as well as a version with an infra-red search light used to spot potential targets for associated Panther tanks equipped with infrared detectors.
More great pics: sdkfz 251, OT-810