Roy, I did all my on a 99 Newmar, about 5 years ago, so far no an issue with them. I just purchase the sealant and seal and took them apart. Time was a day for the first one and then a couple a day after that. I would have to look up the cost if you want. The sealant was about $10 dollars per window and the sealant is around $60 per roll now and you will need 2 rolls with out knowing how many windows you have.
There are several write up here on the forum and many people did theirs following the steps. PM me if you need any help.
Gene