We have ours on this - Fits perfect and has held up over the winter...
https://www.ikea.com/gb/en/p/klasen-...ned-s29033415/ (However the pro is bigger than the Unni 3 so I am not sure yours will fit this exact model although they have other outdoor trolleys that may suit)
Oh and some more tips:
Get PizzApp for your phone - Takes the hassle out of sorting the measurements for the dough.
Get some Caputo Blue Flour - Amazon sell a 1KG bag for about £6 - although you can get it for around £1.75 at some online Italian deli/warehouses.
There was a thread on here a while ago about pizza ovens with some npics of Pizza/recipes etc....
Good luck!