CusterKid-- I'm not from the Medora/Sentinel Butte/Amidon area, but I am from NW North Dakota and just want to wish you a fun time when you visit down there. As you probably know, there are lots of acres of public land down there for you to utilize. Be careful about off-road driving though, as the rules and regs prohibit getting off the established trails now.
What target animals are you planning on shooting? I have never hunted prairie dogs or anything else down in the Amidon area, but have shot prairie dogs and coyotes just north of Medora, on private land and on National Grasslands.
Give us a report on what kind of success you have with your shooting.