Check out this monster. I'd be surprised if you don't need a commercial license to drive it.
http://www.navistar.com/site_layout/severe/cxt.asp
http://www.navistar.com/site_layout/severe/cxt.asp
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.