This is the discussion for the side details you should probably know.

It is impossible to drive the tank in first person. You can try, but good luck seeing where you're going.

The tank uses invisible wheels to stay afloat. Try not to get stuck on fences or things like that.

The tank does have a bumper, and it does not take damage from smashing through trees or fences. However for some reason it refuses to deal damage to zombies. So just stay away from zombies as much as you can when driving this tank.

The tank can submerge underwater via the Ctrl key. However I do not recommend using it where the underwater surface is not very flat. Also, wait for the tank to stabilize on the water before submerging, you might flip the tank if you don't.

The tank's handling is absolutely terrible on water and even more so when reversing on water.
So if you have to turn, either do it on the ground underwater or move very slowly while turning.