Wide Static Caster

I had a need for a wide static (i.e., non-rotating) caster to attach to the bottom of a board for a project I was working on (a table to slide out of the back of our van). However, I couldn't find exactly what I needed, so I made it.

The only part on this that is actually 3D-printed is the roller casing, which I printed in black resin, though other materials may work as well.

I'm in the USA, so US-standard parts are used here. If you're elsewhere, you'll need to figure out the metric equivalent. Parts list per caster:

6 in. 5/16 bolt (1x)
1 in. corner braces/L-brackets (2x, one per side. I did have to drill out the hole to accept a 5/16 bolt; I specifically using this two-pack from Ace Hardware: https://www.acehardware.com/departments/hardware/angles-braces-and-brackets/braces/5289608 )
5/16 locking nut (1x)
5/16 washers (2x)
608 skate bearings (18x, 2 outer used as spacers, 16 glued inside the roller; I purchased these from Amazon, though they did require some degreasing on the o