British Army FV433

FV433 British army tanks  super heavy barrel capable of firing some distance. It’s on rubber tracks so it can be driven on the road.

Armour10 and 12 mm plate
Main
armament
105 mm L13A1 gun, 40 rounds (including 6 rounds HESH) carried
Secondary
armament
7.62 mm L4A4 machine gun with 1,200 roundssmoke dischargers
EngineRolls-Royce K60 Mk 4G multi-fuel opposed piston engine
240 bhp (180 kW) @ 3750 rpm
Power/weight14.5bhp/tonne (10.8 kW/tonne)
Suspensiontorsion bar: 5 units per side
Operational
range
480 km (300 mi)
Maximum speed 29Mph