right or wrong I don't know....I'm still trying to get a handle on this. I'm not really sure how to interpret the weights as they apply in the Goodyear tire guide:
http://www.goodyearrvtires.com/pdfs/tire-care-guide.pdf
Is this guide where you came up with the 110 PSI for the rear, or are you using the max sidewall PSI....which is 110 PSI?