Push or pull - skid steer mower

Hi.

Building a lawn mower rover. It’s wheelbase is about 1 meter wide, 1.3 long. There are two driven wheels at the back, and a pair of caster wheels at the front. The cutting deck will be mounted in the middle.

Question is, should it go forward, or backward? I’ve noticed if it goes caster wheels first, a bump can cause the caster to steer the rover slight off course, where I think if the casters were at the rear, it would have less authority ( and a longer wheel base ). Also, if it goes backwards the drive wheels are on uncut grass, so maybe better traction?

What would be the pro’s con’s on either direction.

Second question, how do I tell the rover when end is which? I mean, its going casters forward by default, is there a simple variable I can change to say the other end if the front of the vehicle, or it is more involved.

Glenn