Even if you go to 15'' wheels, your options for tires is very restricted as I have found out. Only when you get to 16" does the field open up where you can get away from the Chinese trash.
Maxxis is made in Thailand and that is a 15". Don't know what's available in 14", but my guess is there is less available than 15".
I'm not sure FR or anyone else would even notice if you moved up....unless YOU TELL THEM. My experience with FR's warranty was not good and it was all done online. They would have used it as an excuse to void the work they did on my unit even though nothing had anything to do with the wheel/tire size. I went from LRDs to LREs and I'm still having blowouts. Go figure!
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP