No, it's a "Mounty Pole" from Nationwide Trailer Parts at Sherburn near Leeds.@4string is that your own design?
Cost something short of £40 and is well worth it and NTP were a joy to deal with, very helpful and quick delivery. There's another one on the market called "Pro Pole" available from Cargo stop that's similarly priced but has a bewildering array of screw-on heads. There's probably one shaped like a plate that you can stick out of the cab window at the butty van to save getting out of the cab

All joking aside though, I wish I'd bought one a long time ago. I don't mind clambering around on the trailer if I have to, occasionally I have to do this:

...and there's really no other way to do it than the way we've been doing it for decades but for sticking the corner protectors on the pole is worth it's weight in teabags
