Once a wing's suspension has been fixed by Traxxion or RaceTech, they handle like a 900 lbs. sport bike and it also makes for the ultimate touring rig IMHO. They are totally different once the fix has been made. A stock wings suspension sucks bad. It's even worse than a stock VTX if you can beleive that. Speaking of which, my 1800 should be completed in a couple of weeks. It will have RaceTech's Gold valving and springs with all new bushings and seals in the forks and Suspension Technologies rear shocks with custom dampning. It's taken three attempts to dial in the valving of the shocks and get the spring rate correct................ but they should be great.
Both of those wingers are on the GL1800 board. Yellow Wolfs bike has a "Full Monty" Traxxion set up like mine. That consists of new AK-20 fork dampers and springs with adjustable dampning and spring preload fork caps, reworked anti-dive valve, upper and lower billet aluminum triple clamps, All Balls tapered stem bearings, fork brace and Penske rear shock valved by Traxxion.
The guy on the silver wing posted that video a couple of months ago. I can't remember what his bike has.
A wing may look funny on the track, but I would think the guy is trying to find the limits of the wing in a safe environment. Track Days are the perfect venues to do just that. He's hanging off the bike but it not really nessary to do that at the lean angles he's generating. He's acutally not even close to dragging any parts yet. The front crash bars are the first thing to drag on a wing.