After 5,400km/3,375 miles it ws time for new rubber. Decided on a set of Traxion Grippers – 6 Ply, 7/8" lug, 25 8 12 & 25 10 12 Bias ply. Ordered them from 2Kool, shipping was fast.
Traxion is Canadian Company, no price shock from exchange. They resemble Big Horns, and are worth taking look at.