That's the one, Dynatrac ST990. Made by Double Coin. I didn't have a lot to compare to ride-wise since I took the GYs off the second day. These are a rougher ride than I expected. You are supposed to inflate them to 125 PSI to get the 5675 lb load capacity. I think some others you can inflate less to get a similar weight rating. No tire pressure loading charts are available for these tires. I am running mine at 100 PSI.
They are 16 ply, speed symbol J, which technically means they are rated up to 62 MPH. Slightly concerning.... But anyway, I did a fair amount of research and price shopping so I believe them to be a reasonable value. I only have maybe 1500 miles on them so far.
2001 Winnebago Adventurer 35U, F53, V-10, Trimetric batt monitor, Scangauge II, 5 Star Tune, TST 507 TPMS