I agree with your plan of attack, just remember:

1) Be pleasant ans curtious

2) Speak highly in general of traxxs products (afterall u must have liked thier products previously or you wouldnt have bought the 2.5, dont be afraid to list all the traxxas products you own or have purchased or recommended) u the angle the u feel the "truck is not up to the traxxs standards that u are used to and u r disappointed" dont take the i hate traxxas and teh 2.5 sucks attitude.

3) LEad them to belive you are in a position to effect the opinion of many other current/potential customers. (i.e. introduce urself as john doe preseident of 75 memeber "blah blah RC club" in anywhere, US. (do your homework b4 u attempt this)

4) always ask who is the immediate supervisor of the person ur talking to, and ask who is in charge of public relations or who is in charge of your regio`(whether it be the Eastern US, Uk, or what ever), becasue you want to direct your letter to the proper person

They will only to try to appease those who they THINK are still customers. give them the feeling that you will never buy another traxxas product, u will get nothing. Anything they do will be an ATTEMPT TO MAINTAIN A CUSTOMER. If they know ur not a customer (as u state above) U will get SQUAT regardless!!!!