That sounds like barely enough room and weight capacity for three WWII-sized jeeps with small ATGM launchers...not a tank or SPG, or even a minimal armored car.max 7t of weight, but cargohold doesn't seem high enough for an AFV with turret
Cabin Internal Height: 1.83m
Cabin Internal Length: 14.02m
Cabin Internal Width: 2.44m
Vertipedia - Fairey Rotodyne
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A modern MBT would use up the lion's share of that weight capacity just for its crew and its fuel and ammo loads.