I also see the RSS button at the bottom of each page but it doesn't seem to do anything when I click on it. I'm told this works like email, which you didn't mention. Do you have any insight about this?
RSS is a method for "subscribing" to updates from a server, so you get them without having to browse for new postings; the message are not individual like e-mail, so it's more like watching TV with a TiVo (which shows you programs which have become available), where browsing a forum is like looking for videos on YouTube (you go and find it).
A source of information which is distributed by RSS (called a "feed") is received by a program on your end called a "reader."
The FiberglassRV RSS button is a little unusual (because it takes one more step than I expected), and caught me when I first tried it. You click on the RSS button, which pops up a box which says "Fiberglass RV"; you then click on that, and if your browser knows about an RSS reader you will be offered a subscription setup.
I don't know if a Treo supports RSS. Even if it does, you may need to start the RSS reader and tell it to go to FiberglassRV, in case clicking the "RSS" button on the web page doesn't work.