you can also stack boxes like the smarty with a fuel box etc. Check around for prices and features and go with what you like. I went with the quadzilla because I already had the TST and wanted the safety features more than anything else. I know I could have went several other ways but that is the good thing about our trucks we can do it the way we want the only ones we need to make happy is ourselves.
Good luck you will be impressed with the difference how ever you go.