Not exaggerating Timmy!
First, you don’t know if the OP has 14s or 15s. 14s don’t have squat in LT tires. Not even an option really. And since you didn’t specify your were speaking exclusively about 15s then yes it was horrible advice.
15s, about the best you can do is the 2150 lb cap in a LT tire.
Your Endurance’s are a smaller tire with a little more capacity. 55lbs per your post.
But you can get 225 size (1/2” larger diameter) up to 2800+ pound capacity.
So yes you can get a truck tire that is decent I suppose in a 15” size but you can get a ST tire that has almost 700lbs more capacity per tire.
And if the OP has 15s on a trailer with 5200lb axles the truck tires can’t do the job up to the max weight that could be on the trailer.
Next time check all your facts.
By the way speed rating is a non issue. Unless you’re comparing to the cheapest trailer tires on the market. And tread depth/tread wear isn’t either, unless you happen to be the one person out of most who actually puts, say 30-40k miles on your trailer tires before they age out.
AND deeper tread depth is NOT preferable unless off road or in snow for a trailer. Creates more (insignificant amount likely, but it’s there) instability and more tire scrub in tight turns.
Btw, the LT tire bandwagon for small trailer tires lost its wheels a decade or 2 ago, so it might be time to get off the ride!