A friend of mine has been staying at my place the past two days with his fiver in tow on his way back home from winter in Tucson to SW MO where he lives. He has an '06 Ram 3500 swb with a Transfer Flow 70 gallon aux tank mounted in front of his bed and a 16k Reese hitch. He uses a Pop-Up Industries RV-5 kingpin extension to pull a fifth wheel. Has worked great for him.