I ran the Dunlop756 on the rear of my WR450F and was very durable.
My mate had a Mich on the rear of his KTM530 and knocked the knobs off the tyre on sandy,rocky,hardpacked.
Then decided to try the replacement for the dunlop 756 on the rear called Geomax and was very happy with it.
I changed the 756 to the Geomax at the start of the year and after 2 rides,the wear and grip was very good...then sold the bike.