Dan,
Best I can come to your rail needs is either 11" THK RSR20 or 25" SR20W. Either one comes in pairs and both are excellent.
For aluminum frame materials I had to shop the local outlets as I was not finding what I needed on the net or elsewhere.
Understand your issues. We just did a move and that has presented us with some challanges like yours. As for the credit card I am trying to stick with the rule that if I can not pay cash then I can't afford it.
Its a good rule when I can put it into practice.
Mike