This is all good input guys. The basic concept is to allow the TD's to be more involved and last a little longer in the scenarios than they do presently. I have an L70 and have done what I can to beef up the motors and running gear but still on grass it is tougher than it should be to maneuver around especially since I have removed super spin (Strato and I are removing it from all our vehicles and are going to work to have all the club do the same)
Another thought I have had about ambush positions is to put a time frame a vehicle can remain in a fixed position as ExPat said about putting your back to a wall. Like any ambush position you are going to get zeroed eventually so if you have a time frame. Do this and in combination with reduction of hits I think it could be workable. Keep in mind most of us have Clarks for these TD's so we can set our hits by single digits so when we have my L70 for example, perhaps it is set in between light and medium so 4 or 5 hits to destroy rather than the Tamiya medium 6 hits. I have no experience with the Tamiya so I don't know if the hits can be individually set on them or not.

Keep the input and feed back coming we have a couple more weeks before next battleday to play with ideas!