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You CAN run a P series tire on a car trailer according to NHSTA, but when doing so you MUST derate the tire by 10% of its max weight capacity.

An LT rated truck tire can be used at normal rating, just as an ST (trailer specific) tire can be.

Its very common to see many of the name brand trailer companies use the LT tires vs the ST tires. I would not recommend, nor use a P series tire on my own 5000# or larger GVW trailer.

This is not only for ease of replacement on the road, but also because many (if not most) of the ST rated tires are currently imported junk.

That said the trailer companies I have worked for have all used the BFG Commercial LT for tires in the 15 and 16 inch range, and then ST rated name brand tires for the 17.5 inch.

And when it comes to the 22.5 inch stuff, we let the customer decide what he wants to spend.

Also we recommend, and use Magnum balance beads in all sizes.

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Best post.

Dave