Welcome to Cross of Iron, a Company of Heroes modification that aims for a better gameplay experience without making significant changes to the original CoH gameplay.
While not as powerful as the new 75mm AT Halftrack, it can still be a menace to German players due to it's high mobility.
not as powerfull as 75mm AT? 6pdr has better at capabilities than both usa and uk 75mm guns
he is refering to the german AT Halftrack
Don't forget that this mod aims more for balance and good gameplay than realism.
The Autocar 75mm (SP) isn't much tougher than a regular Halftrack, and with it's 6pdr gun being fairly usless against late game tanks, it's best to use it's mobility for hunting down the mid-game vehicles and light tanks. This is one vehicle that really earns it's keep against the Waffen-SS.
where is the turret of that sherman behind the halftrack?
That is a Kangaroo Carrier, a Sherman with the turret out and more space in the hull (due to no ammo needed for the main gun) so troops could be carried. This is somewhat safer than a truck.