Heavier rider + bike + gear, rougher urban streets mostly, occasional packed dirt trails (with thorns, glass shards here and there). I've found the Conti Ride Tour to be pretty darned tough. Zero flats in 3+ years of usage, hitting all sorts of potholes, glass, thorns and other things that used to foul up every other tire I tried.
Might work for you, at your load's weight and roads you ride.
Continental Ride Tour #0101149 -- 47-559 (26x1.75"), 780g, 3/180 TPI, 58 PSI max, with a fairly tough anti-puncture layer. Tread handles streets and dirt trails easily; uncertain about gravel, as I've never used them on those. Tread seems to last well, on such surfaces.
