I am a new member but have been lurking for about 6 months so.....at the risk of being kicked out, I have a tire question. I purchased a new to me 2009 31 foot Keystone Hornet TT in September 2013...
Aside from the obvious issue of costs$$$, I would explore 16" rims and "E" rated tires. In addition I would look into the Good Sam Emergency Road side policy, if you don't already have it. The best $120 per year investiment in your future peace of mind as you RV:)