I, and another owner just had this discussion. Ranger tells us that they put blockers where two molded pieces meet so, there should not be rodent access to the interior of the boat.
That's all the secondhand information I got. I don't know what these 'blockers' are made of. If rodents smell food, they can be awfully destructive to get at it. If I open a package I either put it in the refrigerator or transfer it to Tupperware. And I don't leave trash in the receptacle on the boat when it is docked.
I do know there are gaps in the mating of molded pieces in the cockpit of my 31CB. I haven't traced all these access places to find if there is access to wires, since the boat is new. I've seen rat damage to wires, along with cooked rat. The little devils will chew anything.