I keep a plain transponder key wired (hidden) under my truck. I paid like $3-$4 for the key on eBay. So in the event I lose my remote key I have a key that will start the truck. I also keep a "flat" key handy so I can leave it running and still lock the doors.
****FYI*****
Don't try to start your truck with a "flat" key!!! I will turn over and start, but it only runs for about 3 seconds. If you attempt to start the truck THREE times with a "flat" key or a transponder key that's not programmed to your truck you will be S**T out of luck and your truck will be behind a tow truck enrout to your beloved dealer so they can reset the PCM/ECM..
__________________
2008 3500, QC, SB, 4X4 Laramie, 68RFE, XRT, MP-8, 5" TBE, MPH trans tune, EGR/BlueTec Badge MIA, Volant Power-Core CAI, Raptor 150,Amsoil By-Pass, Mag-Hytec Trans & Rear Diff, Lorenz Bilstein 5100 System, PSC Steering Brace, B&W GN, Ride Rite bags