I am looking into buying a retractable bed cover for my Megacab. I am in the military and constantly throw my gear in the back (so I need to be able to lock it). I need a retractable though so I can keep the functionality of my truck bed for large objects or a gooseneck trailer. I have looked up "roll n lock" and "jack rabbit" brands. What is the best retractable cover? Thanks for your input!!