Goodyear Marathon load d trailer tires

I have run GY Marathons on 2 different TT for the past 10-15 years and the only time I had one blow out was after hitting a hunk of metal on the road. Everyone here always preaches the 80% rule when it comes to towing capacity as a "try not to exceed" measure. I believe that to be true when it comes to tires also. I try to purchase tires with enough load rating so if the camper is maxed out, the tires are only 80% of capacity including the tongue weight if possible. If you take a look at the numbers, I'll bet the recommended tires are barely adequate, and this does not account of uneven loading. (axles too for that matter). Using this method leaves me plenty of cushion to account for impacts to the tires while traveling and uneven loading of the trailer. So far, so good....

Adam