Id make the more or less Tier Tactical of vehicles, heavy and light tanks, IFVs/APCs artillery, the works, that would come in three classes, a speed oriented set of all tanks and whatnot, a midrange, jack-of-all-trades group, and an armor and firepower group.
Of course, with given that there is 5 to 8 vehicles in each group, and I don't know how to code or model, it'll never happen.