If your wheels are rated for 110psi, I would seriously look at the Sailun S637 tires that are G rated and only $150 each at NTB. I have the GY G614s on my camper and love them. However I had two of the bombs as my spares until about a month ago. I went to NTB and ordered the Sailuns. They are spitting images of the GYs. Across all forums in the RV world, they have been getting great reviews. I knew if I ever blew out one of the GYs, the China made ones would not carry the weight, so I bought another steel wheel from Tredit Tire for $41 and then mounted the Sailuns on the wheels. Yes, on long distance trips, I carry two spares. Learned this from a friend several years ago. If you have a heavy trailer, as most of us do here, when you blow one out, before you can get it stopped you have most likely damaged the other remaining tire on that side. PLUS, the Sailuns are rated for #3750 pounds per tire and nearly the same diameter of the GYs.
2012 Sandpiper 365SAQ weighing @ 15k, Onan, 2nd air, slide toppers, TST
2013 F350 6.7L Lariat 4x4 CC DRW,Viair 1007, Ride-Rites, Edge CTS, B&W
2001 Chevy 3500CC DRW 4x4, 8.1L, 4.10 gears w/ Detroit TrueTrac
2001 Ford Excursion Limited 4x4 7.3L,V/B Spring Mod, ProComps, Hellwig Swaybar, & other 'Necessities'