Before buying I would see if there is one you can borrow, I see it mentioned all the time about carrying a spare carcass but until you try it in the front yard you don't really know what your up to.......no point finding out I then middle of now where when the thread leaver bend before getting the tyres over the lip.
In my previous employment we had to fit new tyre using tyre levers....it's enough effort on a defender rim to convince me me two fit any spare carcass with a rim.....**** changing a carcass on the side of the road.

