One important question to me: how old/ tall are the kids?
I personally can't sleep across as I'm too big, but my kids could. This way you would already save space.
In case the kids are 3, 5, 7, 9, 11 it would be much easier for the upcoming years than 15, 17, 19, 21, ... :-)
Their size will even matter more than the age...
Let's knock 2 people out due to pop top roof or fixed high roof or whatever. Leaves 5.
My EB has a standard roof. The second row is always in to not fight with child seats every time you want to sleep...
I put a super simple "podest"/ bed/ platform in, so that I can easily remove it to put some bigger stuff in the rear.
Full width, 7ft in length, exactly as high as my RTIC cooler, that needs to go under :-D
Overall costs ~100$.
The bed is separated in the middle and the inner half has fold in legs. This way I can easily slide the inner half over the rear half of the bed and make space for a 3rd seat row.
My two kiddos are 7 and 9. So if worse comes worst we could sleep the following way:
wife + kids on top, I could sleep under the podest with the gear next to me.
Now thinking your kids might not be 6ft:
- "bed" roughly in the middle, so 2-3 can sleep on top and 2 could sleep under it
- or a foldable 3rd row so that you would also have the seating.
See some pictures with my first set up (w/o the sliding part at that time) for reference. I can still fit in a smaller cooler behind the second row.