Ian,
Add a single solenoid to your exhaust of the solenoid for your tower tilt and you can have several positions instead of two.
Check out this thread to see how:
http://www.chiefdelphi.com/forums/sh...ad.php?t=23934
I think it would be helpful and it would only cost you a 1/4 lb of weight and some extra programming for control of the angle of your tower. This would be helpful both when climbing stairs and when manipulating the 2X ball. If you have any questions about multi-positioning just ask. We did this last year and it worked great.