I found a key shop in Panama City, FL that had the blanks. I forget what they charged, but I had several made. I have a niece that visits when I'm hosting at the beach and she can not keep up with keys.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof