Any recommendations for a bed rail for the couch on our 2007 Fleetwood Bayside? It seems plenty big for our 3 year old to sleep on but not quite wide enough that she wouldn’t fall out while wiggling in her sleep. See the floor plan attached. It’s the couch along the back bunk. I’d also like to use it on her bed at home as she just moved up two nights ago to a big girl bed. Right now we have her toddler mattress on the floor and a pillow blocking the sharp corner of her nightstand. It doesn’t have a box spring, just wood slats underneath the mattress. Any recommendations? Thanks!