I would use #2. ... it has more than enough weight rating.. and Sailun is a excellent tire with very good quality.. Your 5er has a GVW of 14K, the 4 tires in your #2 example can handle 16K plus... more than enough tire.. at 14K GVW for your 5er, your truck will handle at least 2800# of the trailer, pinweight.. Either is a great choice, but simpler replacement would be your #2
I prefer "designated LT tires.. at one time the Sailun tire readLT... but these tires, ST or not, are a great tire with great reviews.. You can't go wrong with these tires.
Jim