I did not have any issues with the Power King tires on my 2010 North Trail nor have I had any issues with the West Lake tires on my 2015 North Trail. Something to consider is that the West Lake tires seem to be rated for 75 MPH. Other ST tires may only be rated to 65 MPH.
I've seen a lot of Westlake tires on TT's when walking around RV dealerships, but haven't read anything bad about them.
We had BlowMax tires on our previous 2013 Heartland Trail Runner and didn't have any issues with them.
However, after reading all of the horror stories about them, whenever we were rolling with them, that fear of having the infamous 'BlowMax BlowOut' was always on my mind.
It seems that most of the BlowMax Power King issues were on the bigger, heavier 5th-wheel trailers more so than the smaller and lighter bumper pull trailers.
Since we had just replaced the BlowMax tires on the Trailer Runner with Hi Run tires one week before we traded it in on our 2015 Heartland Prowler 5th-wheeler, I had them put on the Prowler and put the BlowMax's that came from the factory on the Prowler back on to the Trail Runner.
Ironically, here is a shot I took down in Tucson at Lazy Dayz RV as we were walking around the lot after they had sponsored a lunch for those of us attending the Arizona HOC Rally there last February (this was a brand new Heartland Sundance 5th-wheeler):
Click to enlarge