[Notanlines]

We'll start with brands: Sailun, Maxxis, Carlisle, Goodyear, probably in that order when price and quality are considered.
Avoid any company private brands and Towmax and Trailer King like the plague.
Carlisle tires can be ordered on line from Walmart for about $80-$90 and seem to be the best buy price-wise. Goodyear are the new boys on the block with their Goodyear Endurance, probably been around about three years so not long enough to build an honest reputation one way or another. Do not compare them to the Goodyear Marathon, no longer made, which caused millions of dollars in damage to RVs across the country a few years ago. I believe Goodyear learned their lesson.
Sailun brand usually comes to the top in most cases with learned writers/articles and would get my vote.