Never driven a zed with anything that REO50s on so no idea and I would never guess
They have a stiff sidewall which makes them a little skittish I find in the cold until they have warmed up a bit nothing major but noticeable...
None of the big brand tyres are going to see you in a ditch or fishtailing in the wet, spinning off roundabouts unless you drive like a tit, and if you do in a Zed you could have the best tyres on earth it will do you no good
A Zed is a reasonably powerful RWD car which is very nicely balanced, it is far from a hard car to drive :