I fixed your link. It should work now.
I read the article carefully and it does indeed say:
"So are ST tires your only choice? Not at all. It is possible, and practical, to use automotive light-truck (LT) radial tires on your trailer, provided you keep the load rating in mind. LT tires are also designed for heavy-duty use on pickups and such, and are fine alternatives to ST tires."
However it then goes on to say:
"If you get a flat that destroys a tire such that it can’t be repaired, make sure that the replacement tire is of the same design (whether ST or LT, for example) and size as the original, and has a load rating that matches or exceeds the rating of your original tires."
So from that statement I guess that "If the manufacturer says it should have an ST tire based on design of the camper (number of axles and location) there is enough twisting to require
an ST tire (since they are much more expensive and FR would NEVER put something on the camper that added cost if there was a cheaper alternative).
So if your OEM camper came with LT tires, then it is OK to replace them with LT tires. If it came with ST tires you have to replace them with ST tires. Did I get the gist of that article right?
BTW the rest of the article was quite good. Thank you.