The only downside I can see for these tires, and I not only researched them but actually bought a set of 5) is that they have very tall (and very stiff BTW) side walls.
I found this out the hard way after I totally failed to do my due diligence when I converted my last trailer from 15" wheels to 16" wheels and purchased these Sailun tires. I ended up having to return the Sailuns for another LT tire with much shorter side wall.
On my last trailer the difference was almost 1 1/2" and that cut my space between the top of the tire to the floor of the trailer from a safe 3" to an unsafe 1 1/2".
My new trailer has a more compatible sized OEM tire so I don't expect an issue, the Sailun will only be 1/2" taller, but still a consideration for those considering the Sailuns. These tires are very, very stout!

