Never seen one with a 105mm recoiless turret on the back!! Our local library has a fairly comprehensive book on US military vehicles. It is about 700pages of literally 10s or thousands of different makes, models and variants. Quite amazing the vastly different types of vehicles that have been produced over the years for fleets or one-off missions.
I just love those old WWII half-tracks. Those dang things have been re-engined and overhauled and are still serving as frontline vehicles for some international armies to this day. What a tribute to a great design.