I'll re-iterate what MR said: carry loads low. Always. As the orientation of the machine and it's wheelbase shift, a load that isn't heavy enough to tip it forward can suddenly become "heavy" enough to tip it forward. Examples include:
1) Doing a sharp turn with a heavy load.
2) Starting down an incline with a heavy load.
3) Running into a hole with a heavy load.
4) Backing over a log, blocks, etc., with a heavy load.
5) Getting off the seat with a heavy load.
6) Running low on gas with a heavy load (hey, I'm just trying to be thorough here! /forums/images/graemlins/tongue.gif)
You get the idea. Burn this into your mind: CARRY LOADS LOW .
I'd run it about half-throttle until you get used to driving it...the articulation takes a little bit of getting used to (but not much!).
Happy Tractorin',
/forums/images/graemlins/grin.gifDave