Tires were made the 35th week of 2011 (3511). What were your tire pressures? They should have been maxed out to the cold PSI rating on the sidewall. How fast were you driving? ST tires are rated for 65mph max. Low pressure and/or high speed are the two biggest killers of tires.
'15 XLR 27HFS
'15 Nissan NVP 3500 SL
Campers - Me, DW, 3 - DS (7, 5, 3), 2 large dogs