If you spend any time on Marketplace, you know free trampilines abound. I maintain there's at least one a day on my free stuff finder.
I've always thought one would be handy, but never spent any time chasing one down yet.
One found me today. The reason it's under homesteading is all the stuff a trampoline is made of. Namely tube steel, lots of springs, and a super heavy duty round tarp.
I've already got some legs committed to making a mount fo a mini split for my bunker. And the round tarp I'm going to use as a generator cover, which by happy circumstance is being mounted on a surplus round wood wire spool.
So just food for thought. Next time you see free trampolines, there's a lot of opportunity there. By the time you get two or three, you can get into building structures - livestock pens, greenhouses...