I own a 1999 B21 w 4wd and are considering chains for the rear and front. I'm getting mixed info on if recommended for both. My chain use would be on mtn trails with inclines. As soon as my tire treads load up with mud I'm done moving even without hauling a load. I've heard that I could do some damage running them on both? What have other owners experienced and recommend I tale? Thanks for the feedback!