I made this utility bike trailer. It's not perfect, but it's solid and does the job.

I messed up on the stain, but it's one of my first woodworking projects that I have used stain on, so it's a learning project. It started as one of those child/pet carrier bike trailers. I removed everything but the bare frame and wheels and built it up with wood. It weighs 40lbs, which isn't great, but I have an ebike that helps with the weight. I've only had it for a couple weeks, but I've already used it a few times to get groceries or large things I needed to pick up (don't have a car).