Yeah, what he said. Caveat though .... only two comments above are by owners of the 26M. After the first year of M production, our factory spy (Matt Roving) must have convinced Roger to upsize the trailer tires to 15-inchers. There's a giant capacity difference btw 14s and 15s.
So ... I'm not sure how many 26M owners even have a significant trailer tire issue??
My 26X trailer came with 14-inch D-rated Titans (1,870 lbs each), which left me with less than 200 lbs capacity over my net axle wt. I chose 15-inch C-rated Marathons last summer (2,150 lbs each), but I too recall owner complaints about Goodyear too, especially in their earlier production years. I'm not sure what I'd choose next, but my Marathons clearly inspire more confidence than the Titans.
Maybe ignorance is bliss!
I am still distinctly opposed to the redundant-redundancies of adding an axle to this rig. It adds weight, reduces maneuverabilty and chops springing rebound in half (twice the springing that's needed, by weight). OTOH, a second axle is clearly a simple way to double your tire count, tire patch and tire capacity (albeit, costly) ... pick yer poison & be happy!
Doing over again, I'd just upgrade to 15-inch tires on a single axle, and choose the higher "D" rated Marathons (2,500 lbs. each).
Meanwhile, heat (synonomous with rig weight) is your enemy. As someone already noted above, since upsizing my tires to 15-inchers, they never get any warmer than my truck tires ... previously, the 14-inch Titans were hot enough to make you remove your hand.