Both need bolting attaching to something as they won't balance by them selves.
https://www.ebay.co.uk/itm/325944518177? This one looks interesting and more stable from the photo's
EDIT I have no experience with this.
Nooo Trust me, those folding things are terrible
Oh, as I said looks more stable...
Flimsy wheel things, to me make the building a balanced wheel harder IMO.
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Both need bolting attaching to something as they won't balance by them selves.
https://www.ebay.co.uk/itm/325944518177?
This one looks interesting and more stable from the photo's
EDIT I have no experience with this.