wvaborn:

I fly from tall grass; hence, I made my tri-cycle taller and my wheels bigger.

When it is too windy while taxing, there is more tendency to lift the upwind wing and flip the model.
Also when taxing and turning too fast in a short radius, the same happens.

If extended, the gears may need to be made stronger in order to keep the shape after rough landings, and also to avoid rebounds; however, keep the original distances from the CG to the wheel axis.

As stated above, keep the fuselage horizontal, and also avoid excessive squad of the main gear during landings.

http://www.modelaircraft.org/mag/ftg...0/30main3.html