I have a 2004 NL 9.6. There is a 3/8" drain hole at each rear corner of camper, see attached pic. The owners manual states when off the truck keep the front elevated 2" higher then the rear.
I think this is the same unit.
http://cgi.ebay.com/ebaymotors/2006-Ford-F450-EarthRoamer-XV-LT-RV-Motorhome-camper-06-_W0QQcmdZViewItemQQhashZitem2eb2a42c5bQQitemZ200565599323QQptZRVsQ5fCampers