The only thing that is a concern, seems like ALL tires wear fine. Tread separation is not something that results from odd tread wear or whatever. I just replaced my Mastercraft Avenger GT tires. After a year of towing, they looked brand new. UNTIL one started to produce tread separation causing a vibration when towing. Fortunately I caught this before a blowout. When I took the tires off, one was wildly out of round and you could see where it was larger on one side where the tread was letting go internally. I am now using 8 ply 205/75 R15 myself, and cant tell much difference in how they tow as the MC tires towed just fine. 65 PSI certainly gives a nice load cushion since I have a single-axle trailer with a 19 classic on it. 4400 pounds + load carrying seems much safer than 3200 with the MC tires at 44 psi.