Check out this interesting M113 variant, and give me your opinion from the redleg's point of view. And there was an earlier version that used that British 105 light gun, as per the Brit's Abbott 105 SP gun.
Air transportable and amphibious, with a seven-man crew. Too practical. Instead we field a heavier 8-wheel armoured car with a 120mm mortar that can't be fired from inside the vehicle, but has to be set up outside, then broken down [or abandoned in place, if in a real hurry, like when it starts raining counterbattery fire] before relocating to a new position. Brilliant.
-archy-/-