Help me find aluminum for my trailer

[SuperDutyScaler]

i just finished filling my roof in a few days ago, got the primer on and got it sanded and got the paint on today so i havent pulled the new trailer yet, but just sitting next to the truck frame is looks sooo much better being 48' long. I dont see why tamiya wouldeven sell the trailer that short. Judging by how cheap we can get the aluminum to extend the trailer it would cost tamiya pennies more for a true 48' trailer.