Well, yes, you can add 'bumper guides' to just about any of these smaller trailers...or cameras, an observer or spotter, maybe even a trained monkey that screaches before you hit something!
Bananas not included.
And in fact I added a single bumper guide to one of my small trailers (I was fresh out of trained monkeys!)....it helps a lot, but you really need to use a lightweight fiberglass or wooden pole or stick, whatever, that is flexible or breakable. That's for safety of course, but the downside is that it will eventually bend or snap away, and then you are left with a blind backing situation...unless you carry a couple of spares. Maybe just clip it on when backing?
Anyway, if you are motivated to make it work, then you can make it work. Where there is a will there is a way!