What am I?
You see my cousins at the park or in a mall. Don't worry, we're not very small.
As a sign of status, inside me was a dividing apparatus.
While their parents looked at me and adored, their children certainly did abhor.
I maximize with what I've got, on those long trips you had a spare cot.
First riddle, but if hints are needed, I'll certainly give them!
[Edit 1]: Seems a little harder than I thought, so where's two hints.
I personally have no wheels upon which to move, but the object I'm a part can play music to groove.
The decade when I was popular for people to flop, that big lady Helen lost her top.
Seems we need another hint!
Think second or third base.
Hrmph, this all but gives it away.
While it itself is not mobile, what it's attached to is.