Payton's bark sounds just like Trey. I <3 him. He's looking good. Want to teach my dogs tunnels?
Restrains!! Mine naturally like tunnels anyway but I slap his harness on and do a restrained send. He learned it like lightning. His restrains to a jump are not quite as impressive (I can't get that far back yet, maybe only twenty feet?) but we're doing them the same way.
I do AKC because that's about all there is around here really. If I went up to Chicago I could do anything, but I'm not the world's biggest fan of driving in Chicago so I just... don't.
My first tunnel (it's red and has been in other videos and photos before) came from a place that is out of business now. It's a bummer because I REALLY like that tunnel and absolutely would have bought another from him.
The pink one in the above video was from a big NTI Global sale earlier this year and it was a pretty bangin' deal. I think you can buy smaller ones for toy dogs from them pretty cheaply but if you're investing and plan on a bigger dog later, you might just want to dish out the cash for a competition quality and size one (or similar.)
I have empty milk jugs that I filled with sand that will function as tunnel tamers, I just need bungees or something to loop them together so I can strap it across the top. Otherwise, like Shai said, they move around. With smaller dogs you might be able to get away without for a while though. Auggie and Georgie don't really move mine a whole lot, but P does.