2 aditional wheels generate more drag or resistance, and if the diameter of the wheels are small....the scenario is not better.- Make sure you gear bases are very strong....

Twist 90 dregrees? The best way to reduce this effect is by making sure there is not tow in or out in you mains. Make sure to have both mains very straight....

For what plane is that? I think I know but don't remember the name now

But even better solution is to.....drop a few lays of asfalt to you field ....or cut the grass...[&:]

Good luck.-