They are thinner than standard rebar but I bought a sample pack off Amazon and while not massive they are heavy duty.
I am buying 200 of them... if I am doing my math correctly this should let me do 6 per panel (corners plus middle) with corner stakes pulling double duty holding down neighboring panels. (200 should cover all 4 runs).
I will also be connecting panels with zip ties. I debated using metal twine but got zip ties dirt cheap.
I need to figure out the easiest way to keep other critters out.... I was thinking of skirting with hardware and doing the rest of the hoop with chicken wire.
I will probably use @Krugerrand 's technique for the chicken wire (shown earlier this page), but do the hardware cloth at the bottom horizontally for added structure (zip tied to panel) between hoops.
I like the verticality of @Krugerrand 's hoop using fence stakes... I won't get that just with jbar hooks but i'm hoping my plan still works and I can get a consistent arch.
Alpaca shade building (unpainted), coop in background. Coop has a temporary run for our 16 chicks... The first full hoop run will run the entire length from the coop to the alpaca shed.
Standing where the third building will be next spring, and then the 4th will make a rectangle. 4 hoop runs enclosing a huge veggie garden keeping it safe from deer, rabbits, and, if they go through the chicken or turkey runs, slugs and bugs.
Because one building is for alpaca, and they don't need a run, I will have an extra run... I think I will likely use this to divide the boy and girl rabbits.
Posted pics above, but the general idea is sketched out in post 23 of this thread when I realized a 4 building 'chicken moat' makes more sense (for me) than a single coop with a huge rectangular run around a garden.
That was march 11th... Now I'm 2 buildings closer to being done.