Tires: Date Code approaching 10 yrs. Toyo or Yokohama?

Hey gang, The Rig: 2004 Winnebago Journey 34H DP on the Freightliner / Cat chassis running fairly close to the GVWR of 27,910 (10,410F & 17,500R) Original Tires: Michelin 255/80R22.5 (prop...