I have the Yoko 356 @ 195 D load rating on my 84 westy.  No tracking
problem with mine, and pretty stable at highway speed (55 mph).  My only
complaint is the harshness of the ride on rough roads.  I have had no
traction problem on asphalt, wet or dry. They are not that great on
grass, especially wet grass.  I suspect they would be downright
dangerous on snow, but they were not made for that as they are a summer
tire.

Pascal 
84 Westy