Technically A Transport
Transports. We all know them. Slow. Weaponless. Altogether quite vulnerable. But what if you could fix that little issue? In comes this thing; A humble battlefield bus turned into a substitute front-line tank. Or gunship. And it can still drop off its passengers and cargo most of the time. But who'd want to?
- Star Wars. The Millennium Falcon. Originally a stock light freighter, but has since been upgraded with souped up drives, heavy-duty quad laser cannons, concussion missiles, and a sensor suite that's like seeing the future.
- The Batmobiles seen in The Dark Knight Returns and Batman Begins.
- In the Dawn of the Dead (2004) remake, the survivors turn a tour bus into an armoured zombie killing death machine (complete with slots that let them use chainsaws to get rid of undead hitchers) in order to make a break towards the pier.
- The A-Team with their modified vehicles.
- The movie The Pentagon Wars is about a Real Life development project that went this way: the Bradley Fighting Vehicle started out as a pure troop transport vehicle, but as development continued it acquired more and more features of a tank.
- Car Wars. Big rig trucks are often armed with extensive weaponry in case they're attacked by bandits or have to engage in autodueling.
- Star Fleet Battles. Many interstellar civilizations used armed transports and Q-ships to defend convoys from Orion pirates and other raiders.
- Warhammer 40,000. The Land Raider and the Wave Serpent are both transport vehicles that function at least as well as battle tanks.
- Battlefield 2142: With the Air Transports filled with various members of a squad. Most commonly being Engineers, a Medic/Soldier, and Supports.
- Supreme Commander: A T1 or T2 Dropship loaded with T1 Light Assault Bots. The Cybrans can stick a T2 Mobile Stealth Field Generator with the LAB's to make it impossible to shoot down early without Omni-Sensors. In Forged Alliance,the UEF gets a T3 Dropship with a self-projected shield to jack survivability. The in-house term is "Ghetto Gunship"
- Twisted Metal: Just look at half the vehicles, you'll see it.
- The Batman: Arkham Knight version of the Batmobile has a pair of fold-away harness chairs in an armored compartment, used to get civilians, injured cops and the like to safety.
- PlanetSide 2 has the Sunderer, a Big Badass Rig Base on Wheels. Normally outfitted only with a pair of mediocre 20mm guns and poor armor but the ability to deploy into a spawn point and carry 12 people, it can be outfitted with automatic grenade launchers, heavy armor, and an engine that lets it outrun the game's Cool Bike, all without affecting its spawning ability or carrying capacity. This "Battle Bus" is a terrifying enemy, being a Lightning Bruiser with the capacity to vomit out a dozen people in MAX Powered Armor. The original game also had the Deliverer armored truck and its empire-specific derivatives, which carried less armor but was more agile and amphibious.
- The AC-130 gunship. It's simply a Hercules cargo plane with guns and ammo rolled on board,pointing out the port side. The AC-47 and AC-119 having a similar history.
- Maybe not "a near unstoppable force of destruction", but a technical is a pickup truck fitted with guns (Also seen in Command & Conquer: Generals/Zero Hour, they upgrade increasing their strength through wreckage.) They're pretty cheap—regions vulnerable to the kinds of spontaneous and low-tech armed conflict that technicals show up in tend to have lots of reason (open terrain, farming) to have pickup trucks—and can pack a punch with the right armament, and not to mention can be armored with whatever scrap metal you can find. Disadvantage: The guy in the back actually manning the gun is pretty exposed.
- During the American Civil War the Confederacy salvaged the USS Merrimack and outfitted it with iron plating, renaming it the CSS Virginia.