For those near a Discount Tire or America's Tire store, might give the all-steel, G-rated, Hartland 235/85/16's a look. They also make a poly sidewall/steel version, too.
The Hartland all-steel version is similar in weight (60 lbs.) and construction as the Sailun S637, load rated to 4,080 lbs. at 110 PSI, and "N" (87 mph) speed-rated. DT/AT website says it's "M" speed-rated which is incorrect.
Our local DT tire store matched the lowest online pricing I found for the Sailun S637. Got a set of 4, mounted and balanced, out the door for ~$675.
We've put 5,000 - 6,000 miles on them with no issues so far.