The Multi- Purpose Utility Vehicle or MPUV is an eight-wheeled truck used for many roles. Everything from mobile radar to rocket artillery to tanker to supply carrier. Produced in huge numbers, variants often carry infantry about behind the line of battle. The MPUV also has a tracked variant.
Half tracks have less capacity but are much better off-road and have light armor. There are many variants, with roles such as ambulance, flak gun, mortar carrier, and mobile command post. 
The Shiva Armored Personnel Carrier fills a gap between half-tracks and heavier infantry fighting vehicles. Carrying more armor than a half-track and smoke grenades projectors, the Shiva can deliver infantry to the front lines and carry them in an offensive operation. Standard armament is a heavy machine gun in a remote turret and an automatic grenade projector at the vehicle's front, but an anti-tank missile launcher can be mounted externally. Image here: 
The Rapier APC is built on a heavily-reinforced MPUV chassis, and resembles a BTR-80. It usually carries a 13mm machine gun, but can carry anti-tank missiles instead. It is not a very common vehicle, only used for amphibious operations. The modifications to make the Rapier fast and usable in water or other liquids mean the vehicle lacks protection from anything larger than small arms.
A massive armored superstructure was placed on an Osiris chassis to create the Crusader super-heavy breaching vehicle. It can carry lots of troops, and is armed with a demolition gun (low velocity high caliber, basically a mortar firing horizontally), anti-armor unguided rockets, and several flamethrowers. the Crusader is designed to smash through (literally, it has a huge armored plow) enemy fortifications and disgorge infantry.