It looks pretty, but once you know how it's done you will realize how dirty it is.
Howto:
- By accident i once modeled oversized ammo with physical collision enabled.
- In leveledit i made this ammo move at 25 meters/sec.
- Ingame i went lmao at the size of the ammo.
- A few moments later i noticed wheels of the harvester could actually drive onto the ammo when the ammo moved slow enough.
- I went back to gmax, created a few invisible+collidable planes above eachother.
- Used this as ammo and "yay", i could lift the harvester with it.
- Spiced it up with some random emitter.
- Pie
And nope, you cant really drag the vehicle in the direction you want. You could tweak the ammo model a bit to fake some effects though.