We have a 3010DS with the u shaped dinette. I was wondering where other people store the cushions when using the dinette as a bed, the cab over and jack knife sofa.
We put them in the front driver's and passenger seats. We have found that the dinette cushions do not stay together when sleeping on, so we use an air mattress on top of them and that works better.
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2013 Forest River Sunseeker 3010
We had same trouble with slipping cushions while sleeping, I sewed a luggage strap with a clip onto the underside of a mattress pad to hold it all together
The strap is a good idea, but until I get around to making one, I reverse sides on the bottom cushions and turn them over to fit, that places the long rectangular piece against the wall and the rounded one on the outside (with a piece of rug non-slip under it) with a fitted sheet over all and all is good. Just make sure all the zipper pulls are hidden or they'll make you miserable.