Living units of all types are welcomed in the tent village(Sac-Fox). However it is just open grassy expanses. Along with a shower building! So no level pad, electricity, water or sewer. As you say can never tell about the condition of the gnomes. So that being said if looking for more I suggest two places.

Wilderness Campground-very wooded with water, electricity and pads. However no sewer. This would be situated between festival grounds and the tent city. When I camp I like this spot, even for tents because of the woods.

The other is Bald Eagle Campground. This is at the front of the park near the festival grounds but far from the tent city. This is where the "big rigs" go! Concrete pads and sewer hook ups are the norm here. Oh yeah and I even think Wi-Fi!! It is a new campground and does not have much shade or character yet.

http://www.scottcountyiowa.com/conservation/scottco.php

Can't wait to meet you and the kin!