I belong to WIT ,Winnebago owners club. I have been on 7 caravans with them and at least 50 campouts since 2001. Of the hundreds of owners I have met no one has had this problem. I am not saying this hasn't happened. I am just saying it must be very rare. I do have the roof cleaned and inspected once a year on all the Winnebago MH's I have owned. Never had an issue other than I had to have an area rechauked on one of them after 6 years. Have your roof checked once a year no matter what MH you own.
I still would recommend Michelin tires thru FMCA. check it out. well worth the dues for FMCA, not to list the other benefits. There has been a lot of comments about Hancock tires on this site. I have had very bad luck with them. I will stay with Michelin.