Are these the oem tires and Suggestions for replacements?

[cvin]

This is on my new to me 2015 outback 23trs

Trailer king ST radial
Looks like 5114, is this may of 2014?

ST225/75R15

Do not love they are load range D

Will probably replace them especially if oem

Would like to get load range E
Wondering if possible to go a little bigger? Or if i can get load range E in this size

Any info is appreciated, have had lots of horse trailers and flatbeds but no travel trailers