brucecvoss - you asked for some personal experience - I have chains for all 4 R4 tires on my Cub Cadet 7260, but have never used the rear ones. I plow my 1/4 mile, far from flat, driveway here in Northern VT. using the chains on the front tires only. It works real well. Besides increasing overall traction enabling me to get up my driveway with no problems even in icy conditions, they enable me to steer the tractor when my rear mounted grader blade is angled off to one side (a BIG plus), rear fender clearance is not a problem (although on my Cub there is sufficient clearance), and they don't effect the 'ride' nearly as much as rear mounted chains do. I made up my own chains from old dump truck chains, so they aren't anything fancy (and the price was real right..). Oh, I might add that I have all 4 tires loaded with windshield washer antifreeze.
Corm