"IF" you're planning on "boosting" during the 1-60 RAF leveling, you do NOT want any of the RAF accounts linked to your boosting character account.

On the other hand, if you plan on questing and/or instance running with just the RAF group (my preference), then you would want to link to your existing vetran account, as you get the free extrra month(s), the mount(s), and gifted levels to characters on that account. So:

NewA > Linked to RAF-1
NewA > Linked to RAF-2
---- OR -------------------
NewA > Linked to RAF-1, which is linked to RAF-2
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Either of the above will work for Boosting OR questing, but you'd need to be four boxing to boost with this group



Existing VetranA, new RAF character > Linked to RAF-1
Existing VetranA, new RAF character > Linked to RAF-2
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This will ONLY work for questing, the minute you replace the low level character on the Vetran account to boost, the two RAF characters will only get normal quest experience and rested bonus if they have any. Bye bye 3x RAF bonus

If you only want to BOOST two characters, you could do Vetran > linked to RAF-1, which is linked to RAF-2, but then you'd be losing 50% of your RAF potential.