In the state of Iowa, game wardens have jurisdiction over the entire state with authority to enforce all game, fish, and criminal laws, similar to a state trooper.
What is the ultimate desired outcome here for public land hunters? Is it for property owners to be required to install/maintain a permanent legal easement to the public areas? If so, and I'm simply playing devil's advocate here so don't freak out, who is responsible for any damage, vandlization, or other potential issues associated with the easement? For example, if its a rancher that has cows, sheep, etc..., who is responsible if gates are left open or fences are damaged? If guys cross the easement with horses, mules, or vehicles, who has to repair any ruts or address potential erosion or other problems? What about littering? I know we'd all like to think that hunters would be respectful, but if you've been to any public hunting or fishing area you've seen the empty shell casings, trash, fishing line, aluminum cans, etc..., that are left in some areas.
The first thing property owners are going to ask is who is responsible for these types of issues with any proposed easement, and if the answer is the land owner, things will not go in favor of the public land hunters I'm guessing.