F channel source.
I found a great price and shipping on 5 sticks of 8 foot "F" channel. Way cheaper than VTS, I believe this is the source for VTS. If I bought it at VTS with the PVC pipe it would have cost $150+. The cost form My source is brunnerent.com and cost $110. Not a ton of savings but if you have a larger trailer in need more that 5 then it would add up. FYI 8 ft is the longest that UPS will ship, if you need longer then you will have to pay for freight via a flat bed truck at around $200 bucks.
Ever notice an Airstream resembles a piggy bank