Multiplayer vehicle game - physics or not to physics

Hello guys,

I have been searching for clue for some time and did not find anything about my problem.

I am making game, where you drive vehicle (tank, to be specific) across terrain. First I have tried physics for moving it around, but it produced sometimes behaviour I didn't like, and to be honest, after some time of research, I gave it up to fix it.

So I went with manual implementation of terrain hugging, which works relatively good, but now I am making same decision again. The reason is, I need to implement some movement limitations for vehicle, like slopes, etc. and it seems to be a quite a lot of work, The second reason is that the main focus of the game is multiplayer (6 players max driving vehicles).

What is more suitable - talking about effectivity and outcome? Use physics, or stick with manual terrain hugging? With respect of the multiplayer question.