I just swapped out tires this weekend. I had almost 22k on them, with the rear showing cords and the front with maybe 8k left to give.
I will be running a BBG Trifecta and didn't want to take chances. PR2s all the way (300k on FJRs with them) usually 42psi Front & 41psi
in the rear. If you are concerned carry a tube of shoe goo to smear on the cords, should they show. I just ordered 3 tubes. LOL
Really with PR2s, I can count on 15k on the rear and 25k on the front.
May I suggest you change tires in Minnesota? There are forum members riding with you that live nearby that would help you-
Order tires and have them sent to them. OR I have a shop that I highly recommend in Indianola Iowa (16 miles south of I-35/I-80
intersection) This would give you a good scrub ride to Minnesota. If you want their contact PM me. They will match prices from online
sources and have you in and out. Many options for you. I will be looking for you at the finish. May you have a great (& safe) ride!