I would go with a large sturdy cage or Congo for 5 gliders.
My cages (no longer available) are very close in size to these but 6 inches shorter and they house colonies of 3, 5 and 6 gliders just fine. I have two Stealth wheels and 3 sections of Ferret tunnels in each cage along with a rotating variety of floor and hanging toys.
It is easy to wheel them out the back door - I clean the wheels and tunnels in place when I clean the cage with soap and water and the hose.
I towel dry the cage then leave it in the sun for an hour or so to fully dry.