It takes roughly 500 Logi truck trips to unlock the tank.

Starting at level 3 (which unlocks the Ural) it takes roughly 500 round trips in this logi truck to unlock the tank (at 1500 driver xp per two pallets). Driving at 79 km/h for 3-4km takes 4-6mins per trip. Which if my math is correct; takes about 25-33hrs of gameplay just to unlock the tank. I'm also not sure if it's the best way to get driver xp or not.