If you have a flight out of terminal 52, you will need to take a shuttle bus from either terminal 4 or terminal 5. Getting on the shuttle from terminal 5 is faster than terminal 4 because the TSA line is generally faster AND because the gate to take the shuttle is closer than terminal 4’s gate.
Shuttle capacity could vary but the image below is the front of the larger capacity shuttle bus. The second image is the back.
The image below is the back of the bus. The best way to store your luggage is like so, with your luggage and bag on top ready to leave the bus through the middle doors. Many flight attendants store their back like so: