Chev Man is correct. I have only bought one set of tires for an RV. I had a 1997, 2000, 2003, 2006, 2010, and now a 2013. So you see the trading cycle. I would not say I was unhappy with the Landmark - just a lot of little thing that had to be fixed during the first year.
I would not buy another one of them with the drastic increase in price. I would probably buy a Big Sky since my 2000, 2003 and 2006 were all Montana's with minimal issues. The Full Body paint is a must for me to have. I have not ruled out a DRV Mobile Suites.
Chev Man is also correct with trading Trucks about every 3 years as well. Nothing at all wrong with someone doing either trading Trucks or RV's if he and she wants to.