The left front wheel was moving water, no traction there, that's why the right front was open.

I have Firestone ATX 23, 31"x 10.5". The 23 is 23 degrees, the inclination of the tread lugs (is that the correct term?). They are a bit stiff, but with good tread.

My favourite are Goodyear MTR 32", but not only are they expensive, but also they wear out quicker than other tyres.