Nor are the Stynkers amphibious, so don't try to cross a blue line on your map in one. At least the Marine 8-wheelies can cross rivers, given reasonable flow rates and an undefended or lightly defended gently sloped opposite riverbank.
A lightweight tank - a “Sheridan V2.0” if you would, would give planners at least some tracked armor light enough for limited MOUT operations.
Think a Sheridan turret on an M2 Bradley chassis. The Australians used something very similar with a Sheridan turret on an M113 *Bucket* chassis in Vietnam, very useful when canister fire support was called for. There are a lot of those little flechette roofing nails in a 152mm round.
You are talking about the M113FSV. They mounted a turret off the Saladin armored car with a 76mm gun.