Vehicle designs

So for my vechile I wanted to base it on a military type vechile but set in a Sci Fi era, I recently saw James Cameron movie Avater and was inspired by the way he was able to make his vechiles look dramatic and futuristic but also keep a realism to them and make them look as though they could really exist.

I want to do a troop carrier vechile, one that will be big, almost like a tank quality look to it, something that could look like an all terrain vechile. At first I wanted to do a air type vechile but after much thought I'm heading more towards a land based vechile.