Update. thanks to all who gave me information. I did try the WalMart in LaGrange before posting. Person who answered said they did not have load range E.
With everyone's help, I was able to locate TWO tires, the exact size I needed this morning, in Manchester, GA about 20 miles away. One is mounted, ready to put on trailer and the other is a tire by itself, but if I have another blowout going home, at least I will have a spare. So, thanks EVERYONE.
I kept the blownout tire and taking it back to hometown dealer. The mfg date was 4215 and installed on Dec. 9, 2015. Today's dealer said he could no reason for it. So, I will tote it home and hope an adjustment can be made.
Most important thing is I have a tire, correct size, to start back 450 miles.
Y'all have a Merry Christmas.