Midbunk trifold sofa replacement

[Jfielding]

We use our mid-bunk primarily as an office or bedroom for our adult kids when they visit. The sofa is so uncomfortable for them - even with a foam topper. I would like to replace the sofa with whatever largest fold out I can find to fit that space. Does anyone know the length between the back wall of the slide and the front of the drawers in the mid-bunk area? Our 2020 Solitude 377mbr is currently winterized and in storage.

Thanks for assist and any tips on replacing the sofa!

PS. Has anyone sold theirs? Ours in great shape, just uncomfy to sleep on!