Cheese1
Not happy to hear you are getting tired of your 213.
For that 46-16= $30k, it would seem like there is incentive to find a way to do a furniture mod that gives a bit more walking room in the 213.
What if you use the fold up sofa as a dining seat with a long narrow (removable) dinette table parallel to the sofa. Remove the dinette seats and table opposite the sofa now and place a thinner but longer water tank along the wall along with moving the water pump and its neighboring electrical stuff. Enclose all this in a long box that hugs the bottom of the wall from kitchen to drivers' seat. "Somehow' fashion a fold-down bed surface that comes to meet the sofa when it is made down. It might be easier to move sofa to where the dinette is and try to place water tank, pump, fuse box,etc. under it.
I will think on this a bit, but something like it might work.
If two narrower twin beds like the Built for two Born Free has would work...
BTW do you know what type house battery you have and/or if you've done anything with it?