I use 3 exercise pens that can be taken apart & then hooked together. And a couple of pieces of lattice that I got from Lowe's to block the area under the camper. These are from the 1st trip in the Roo just a few weeks ago.
Ann ("Older than springtime, younger than dirt.")
2018 Palomino Solaire 240BHS
2018 Toyota RAV4 XLE (No, it won't pull the camper.)
Molly, my camping cockapoo, crossed the Rainbow Bridge this past May. She was almost 18. Still miss her.