The artillery piece in front is an 18/25 pounder Mk1. A WWI 18 pounder MkIII on a MkVP split trail carriage, as an emergency measure whilst production of the modern 25 pounder got up to speed the old 18 pounder barrels and chambers were rebored to fire the newer ammunition.
Yes they did The 10 TP was like the soviet BT tanks. So it means that the tank could go either on wheels or tracks depending on a road. However the idea of using a vehicle without track on polish reads to make it faster was entired misplaced. The suspension system was too complex and fallible. Therefore the design was going to be modified by giving up the wheel system without the tracks and using the standard track suspension system instead. The drive control system was found good but required a couple of minor changings. Instead of the wheel system that also made the tank heavier , it was recommended to attach thicker armour. Because there was another design of heavier tank ( PZInż 14 TP ) running simultaneously, the 10 TP was aborted. A couple of sources say the tank was destroyed during the September Campaign by Germans while other ones say it was dismounted by Poles.