Not mine, but yeah, I don't see OP pulling this off in a hilly area.

The first one is more of a garden cart rather than a bike trailer. It's connected onto the side of the rear rack with some bits of driftwood screwed together :) The rest are just trailer connectors attached somewhere on the previous trailer.

Yes, that's true... There's only one small hill I had to go up. With low enough gears though, much steeper hills should be possible.

Thanks! Bike trailers are great at corners. You can easily do a u-turn with one. The way the second trailer is connected to the front hand cart though, limits it to about 45°. While cycling though, there are no issues, just cycle maybe a metre from the edge of the road.

It's actually not bad at corners. You'd probably be fine cycling maybe a metre further out than usual.

You could probably move a similar amount on just one large trailer, which might be easier to manoeuvre round a city. Bikes at work has some cool examples:

• https://www.bikesatwork.com/bike-trailers/customers
• https://www.pedalpeople.coop/index.php?page=12

I find the best way to get free things is to let people know you're interested in those things. I recently took over the local bike hire, and now everyone knows I enjoy repairing bicycles. I've had multiple people approach me to get rid of their old bicycles. That's how I got 2 of the trailers. This presumably works best in places with stronger community.

Otherwise, I think keeping an eye on local buy/sell websites (eg facebook/gumtree/freecycle). I think you're likely to find an old child trailer, which you can remove the cover and sides from to get a trailer base. Maybe try putting "wanted" posts on these websites as well, as people might not realise a torn or rusty child trailer is worth anything.

Theoretically they should be rather easy to make from scratch, though I've not done this yet. They are really just a frame with small bike wheels and a hitch.

I've put it in there, but I'm not sure if it's even possible to create tags like that from lemmy.

Yes... I'd love to make one myself. I have an idea for one with swappable wheels: small wheels which don't stick up above the trailer bed (for carrying wide things), and large wheels for a less bumpy journey.

The hand cart which I have at the front is great for carrying large/wide things, but the wheels can't handle cattle grids or rabbit holes...

You're right, there are not many hills here. Only 1 small one I had to climb. I do think that with low enough gears and enough time, hills won't be much of a problem.

You could also do the hill in multiple trips, temporarily leaving one of the trailers behind.

I would not say a trailer adds stability. The connection between the bike and the trailer is somewhat flexible, so there's a constant yoink-yoink going on when you are going up even a moderate uphill. And the physics of pulling a trailer also mean that sometimes the trailer begins a small downhill when you're already on the flat. That means, you suddenly get accelerated as the trailer reaches the dip and rolls down it, pushing you forwards. Also when you need to stop fast, the physics are a bit different than when you are riding just a bike.

The difference is not huge, but if something, it makes holding the balance a little bit more difficult.