I'm reading the Google SEO starter guide and on page 11 it says you should prepare a site for users and one for search engines in XML.
My site is about vehicles, and vehicle is not in a separate folder. It gets loaded dynamically with GET and PHP – so can Google crawl this if it's "not really there"?
The pages are there under ?GET variables like home.com/seevehicles?2009-camar so am I doing it wrong or can Google also crawl this?
Just make hyperlinks using hard coded links to the homepage. Job done. It can crawl any HREF.
Once you have these links, build a sitemap.xml and link to it in Google Webmaster Tools.
Dynamic content is "dynamic" only server-side, clients always get just plain HTML (in other words: everything is static when it reaches client). It doesn't matter for a browser (or a crawler) if the document was dynamic or static, it's all the same: just a bunch of tags that it has to interpret.
If a regular visitor can see a link (or a hyperlink, if you prefer that name), it means that his browser has found a <a> tag and interpreted it as a link. If a browser could do that, then crawler can do that too. So, a crawler has an URL, it will follow it and do its job again: index it and follow next links. It doesn't magically enumerate server files and hit them one by one, it's only following links.
