I have 30-40K on the front tires with Firestone HT's. Rears got replaced a bit ago due to having a 3/8" bolt going thru the tread. So both rears were replaced as I am about half worn out. This is on a Sprinter van, LONG WB, about 5500 empty, upwards of 8-9000 fully loaded. Mostly freeway or main 2 lane hwys from seattle south to Olympia, up and down both sides of sound to Bremerton, then up to port Angelas and port townsend a lot too. Do a minimum of 500 miles to upwards of 1000 miles a week. Put these on last fall.
Found them to be good overall in rain and dry weather. Get about 1 mpg more than the stock Continental VanDura that came stock. Also quieter too. I am hard of hearing, but could hear more road noise with initial tires vs Firestones.
Like all things great and small, you mileage may vary!
marty