The UNSC has had these vehicles confirmed for differing roles so far:
The Warthog (of course), fast moving yet decently armored vehicle along with pretty respectable firepower against ground troops but is outmatched by anything bigger than a Chopper. It also has a variant that removes its turret and replaces it with seating for more passengers, along with another variant that replaces its turret with a rocket launcher. This vehicle primarily performs best in medium range ground engagements against foot-soldiers and lightweight vehicles.
The Razorback, cousin to the Warthog, roughly the same speed as the Warthog but sacrifices firepower for armor. Lacking a turret, the razorback can instead carry extra passengers along with weapons and objectives. Due to lacking any standard weapon attached to the vehicle, the Razorback is variable in combat capability. Of course, if 3 passengers happen to have SPNKr Rocket Launchers, this vehicle is just about any enemy’s worst nightmare. But more often than not, passenger’s firearms will not be able to match the firepower of a vehicle. This vehicle performs best as a team transport as well as a supplier of gear and is not primarily for the purpose of direct offensive combat.
The Scorpion, what the ladies like, much slower than either of the prior two vehicles, this tank is about as agile as the Titanic. Instead, the Scorpion gives up any possible advantage in dexterity for a massive increase in armor and firepower. The Scorpion has an incredibly powerful cannon, capable of devastating a Warthog in 1-2 shots. In terms of durability the Scorpion is practically unrivaled, capable of eating SPNKr rockets whole for breakfast. This vehicle performs best in long/medium range ground engagements against anything that moves in a purely offensive playstyle.
The Mongoose, pure speed on wheels, gives up armor and firepower for acceleration and agility. Generally outfitted with a secondary seat that a passenger can fire weapons off of, the Mongoose is not completely defenseless. However, the Mongoose lacks the combat capability to perform well in any other situation than medium/close range ground engagements against small groups of foot-soldiers.
The Wasp, an emphasis on firepower rather than agility in an aerial vehicle, faster than most vehicles due to it being able to ignore most terrain related difficulties. As an aerial vehicle its durability is very low for a vehicle but likely compensates for being admittedly harder to hit and housing some serious firepower. The Wasp primarily performs best attacking virtually any foe that doesn’t have major anti-air capabilities. For example, a Wasp attacking a Wraith is likely in the Wasp’s favor, but attacking a Scorpion is an extremely bad idea.
So as you can see, we have a vehicles for: Fast Moving Transportation in the Mongoose, Offensive Air Support in the Wasp, Offensive Ground Support in the Scorpion, Objective Capture and Gear Supply in the Razorback, and a balance of all of these in the Warthog. Yet there seems to be a gap in the Vehicle roles, none of these vehicles appear to have the role of specifically targeting vehicles. The ideal attacker of a vehicle would be a fast moving, hard hitting vehicle that can take a hit but would be relatively fragile for its size.
Let me introduce to you the Vehicle which occupied this role in Halo Wars 2. The Cyclops. In Halo Infinite, the Cyclops would be a vehicle which does not have an emphasis on direct speed, capable of being outstripped by a Warthog, Ghost, Wasp, Banshee, Razorback, or Chopper, but can outrun any of the larger vehicles that do the most damage, for example, the Scorpion and the Wraith. The Cyclops is outfitted with a cannon on its arm that works similarly to the Scorpion’s cannon, but is weaker and can fire 3 shots instead of 1. The Cyclops also has the ability to dash to the side almost instantaneously due to its powerful legs to dodge shots. Naturally this ability would have a decently large cooldown. The Cyclops’s cannon is ineffective against foot-soldiers because it literally does no splash damage, it is a single projectile that is not explosive but is designed for piercing instead, so a quickly moving soldier can be quite a challenge to hit while a Ghost can be an easy target. The Cyclops’s cannon has nowhere near the range of the Scorpion, generally having to get within a distance that its targets can return fire. To compensate the Cyclops’s cannon can deliver quite a punch per round, but its 3 successive shots can decimate a Scorpion. The Cyclops is not unusually durable for a vehicle, but it is tough enough to withstand 1 round from a Scorpion and be on its last legs. If this Scorpion has a gunner the Cyclops has no chance in direct combat but may win with the advantage of surprise. Now you may be thinking, “But if it can take out the Scorpion with 1 burst while the Scorpion needs 2 shots how would the Scorpion win without a gunner?” The answer is that the Cyclops takes FOREVER to reload, each round in its 3 round magazine must be reloaded individually and each one takes an amount of time to reload that is comparable to how long a Scorpion takes to reload one shot. So once it fires, it HAS to get its 3 shots in before the Scorpion returns fire or else its toast.
This idea is likely unfit to be instantly carried into the game, so I would like your ideas on what you would want changed about it.