This is a website I have designed for my fathers company. It was designed a little over 6 months ago. I just want some feedback on the usability of the site. I realize its not fully web 2.0 yet but I still have some graphical changes to make. Is the inventory easy to navigate? What are your thoughts on my SEO? Should I add a bread crumb nav underneath the main navigation?

URL: http://www.trucksmartsales.com/

It's too dull and old school. Take a look at those CSS galleries, somehow draw illustrations and redesign a web-site.

Not a good idea to include pages that are under construction into menu. Just remove them from menu.

Another bad idea is a search form on a separate page. I think this web-site does not need such search function at all. Just upgrade your Inventory page a little bit. You have some sorting functionality which has no feedback. When I sort list by price, I should notice that by some state of price button. By the way, Inventory page makes my browser (Chrome) slowing down a little bit.