I have 06 Discovery with the same Goodyear size tires and agree with you on looking flat with the psi around 90. I put this same question on sereral forums and got just as many answers. I run mine at 100 psi (way under max) and have good tread wear and ride with over 6,000 miles so far. The Goodyear tire chart gives the best answer to our question, goes by the weight placed on each tire, so it's best to get you RV weighed. Happy RVing!
Larry & Darlene 06 39L DP
The tire chart is located at:
Http:goodyear.com/rv/pdf/rv/inflation.pdf
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2006 Discovery 39L
2006 Liberty Toad
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