Writing preferred position letter

How should I structure my preferred position letter since they, management and my shop steward, is telling I can not just pump people with less seniority than me, so I have to write a letter stating what positions I want to work and I am the next to go to that position before anyone else. I have the positions stated just do not know how to structure the language of the letter.
 

PiedmontSteward

RTW-4-Less
I sure wish that my center did that I don't understand how different centers can have different rules.

My supplement (Atlantic Area) requires this in writing. Every supplement has different procedures but a letter of intent sounds a bit off to me. I wouldn't put too much effort into it.

Ie.

To whom it may concern,

I am PreLoad Mule and my seniority date is xx/xx/2xxx. I am interested in the following positions:



Sincerely,
Preload Mule (include date and include stewards signature)
 
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