I have a similar issue with sleeping 4, one teenager, one younger child, wife and myself. Also need to occasionally eat together inside at a table. Most truck campers are just not laid out for this kind of family, so I bought an ATC Cougar shell (8 foot on my 6.5 foot Toyota Tundra bed), biggest shell I could find. I built bench seats down below that fold out to make two sleeping platforms that are about 24″ wide. Kids are happy they have their own beds.
Bench seating for 4 (table not present yet)…
Bed configuration for 2 kids downstairs…
There is some storage under the bench seats/beds.
Used birch plywood from Home depot and oak or pine for the slides and supports..
