When my Goodyear Marathons were 4 eyars old, but only 3 years of use, one tire blew.
If the tires are mote than 3 years old, I would probably replace them. Tires are not that expensive. The date of tire manufacture is coded on the sidewall.
A few years ago my truck died , and I used my father in laws 1989 Suburban to tow the TM home, about 50 miles of freeway. I left lots of room because I had no trailer brakes. I was fine. I would do it again for a modest distance. If the 300 miles is relatively flat and light traffic I would not be concerned with driving with no trailer brakes with a BIG truck or SUV.
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