Yeah, the Maxxis would be a great plan b if you you don't go with Sailun. I replaced the OEM junk on a previous Cougar and our current Montana as soon as I got them home with the Maxxis. Haven't had a minutes trouble. I was leaning to Sailuns and called Tredit Wheel Co. about the pressure issue. They said do not run the wheel higher than 80psi, it could crack around the hub.
I had Discount Tire order the Maxxis. Took a couple days to get them.
You might also look at the new Carlisle Trail "HD". I haven't heard any negative reviews. I just put them on a utility trailer.
I think you would be good running the Sailuns at 80psi if you do the math and are sure they are within load rating. I can't imagine how they would not be.
If you are on the Rodney Crowell side of town, the Discount Tire store on Decker Drive in Baytown has plenty of room for trailers. If you're on the Lyle Lovett side, you're on your own! LOL