What danger for old tires?

Hi, I got my hands on 2 tires Dunlop SP Sport 2000 in 225/60 15, which I would like to drive on the VW bus (pure summer vehicle, but also at times highway up to 180km/h, annual driving power 2000km). Profile still brand new, but the tires are 11 years old. What risk do I take with this exactly? Nettle characteristics are almost irrelevant, since the car is not moved in the rain. How does it look with braking characteristics? The rubber could be a bit hard (comfort does not matter, is 90mm deeper… , there is not much more with comfort…). The tire is identical to the mounted ones, of which 2 (from 2003) still have 4-5mm. Where should I drive the “new” ones? Usually yes the better ones to the rear (except: rear drive), but does this also apply in case the tires are old and rather a little harder? I also know that I should put the tires in the garbage bin best. But let’s leave the option outside before… I am grateful for tips.