U-hauls are more unique! Built as rentals, they use a lot of proprietary components so there would be no market for the parts. So, not much interchangeability. Upside is they were also designed to be more rugged than similar trailers like Scamp
I believe the best source for information about brand-specific parts and repairs is the U-Haul
Facebook page. It's very active, and lots of help there. I'm sure another U-Haul owner will be along soon to point you there.
Meantime, I hope you'll stay active here for issues of a more general nature. We love pictures!
Welcome, congratulations on your new trailer, and happy camping!