Fffffffuuuuuuuuuu.
Tweaked one of the fenders on my trike when I was carrying it outside, and APPARENTLY shoved the fender mounting bolts up against the sidewall of one of my tires. And, these tires have really thin, supple sidewalls to reduce rolling resistance and improve ride comfort, because they don't need as strong sidewalls as a standard bicycle tire has (the thing isn't riding on the sides of the tread after all).
About 4.5 mi into my ride, and 4 mi from home, got a slow flat. Headed for a safe location, found what happened, and decided to see what I could do with a replacement tube. The sidewall damage was enough that even with a little air, it started bulging, so I deflated it, stuck a $5 in where it was bulging, and then partially inflated it, and rode home, being careful to miss all the potholes. Even hit 19.5 mph when I was trying to keep up with traffic, and it was... fine.
And, the manufacturer's US site is out of stock, although I did find that a trike dealer in Utah had four in stock, so I ordered two from them. (Realizing how easy these are to shred, I figure keeping a spare at home isn't a bad idea.)