I've been thinking about a unique gamemode, which might seem a bit complicated first, but in my opinion it's not that hard to understand.
The idea comes from a beloved game of mine, Company Of Heroes. I hope a lot of you guys have played the game, because it's really good. I know it's an RTS, but the map design and the objectives caught my attention. Below you can see an actual map from CoH, and you can see differently labelled territories. There is Ammunition Depot (talking about it below), Fuel Depot (talking about it later), normal Capture Points (for now,nothing to do with it here, I haven't come up with an idea to implement into here), and point generating Capture Points (nothing to do with it yet, because the main objective is not collecting points), so Ammunition and Fuel Depot is important right now.
Obviously there would be 2 teams:
1. The Attackers: they need to help their supply truck ("a payload"). But it's not that easy. To be able to escort the truck, they have to capture the Fuel Depot. More Fuel Depot mean more fuel, so if the defending team captures these territories (so the truck will not get more fuel until The Attackers recapture the territories), the truck will move constantly until it uses up the rest of the fuel.
2. The Defenders: they have to recapture these Fuel Depot, so the attacking team can not fuel the truck, ergo the truck stops. Basically, they have to shut down the resupply of the truck. They should have some machine gun emplacements around the more important locations of the map, to make an attacker assault harder.
There would be Ammunition Depot as mentioned above, a territory where you can resupply ammunition and/or counsumables, equipment, but it is only possible to resupply, if the Ammunition Depot is under your team's control.
Fuel Depot: It produces X amount of fuel every X seconds. (The truck uses up X amount of it every second)
Ammunition Depot: Limited resupplies. Resupplies restore every 3 minute.
Important: Your team can capture a territory (it does not matter which, Fuel or Ammo), if the sector you wanna capture is connected directly, or through other territories to your team's HQ (where you can respawn). If you lose the territory which has connected one (or more sectors) to your HQ, your team will have 1-2 minutes to recapture that territory before the one it has connected to the HQ, becomes neutral.
This gamemode would have a bigger map, with around 8-10 players to participate in battle (I would not consider more, because in this case, every decision can be the key to victory, so you always have to cosider which move is the best for your team, and which is not). I was thinking about maps designed around the Red Ball Express for example and other convoys in WW2.
Since this game is infantry combat focused, it wouldn't be possible to get into the vehicle you need to escort.
These are my ideas for now in connection with this gamemode. Looking forward to hear your thoughts about this idea.
Ps.: If something is not clear, feel free to ask and I'll try to answer as well as I can.