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...
Heavier duty tires are always nice... but to replace 3 year old tires in good shape? I would keep them. But...
If it is going to bug you the whole time you are towing, then replace them. Make sure you get a good trade-in for the relatively new tires, or better yet sell them yourself as some other lighter TT owner would probably love to have them.