We Claim:
1. A service trolley, comprising:
a frame having an upper end opposite a lower end; a tabletop arranged on the upper end of the frame;
wheels arranged on the lower end of the frame configured to allow the frame to roll on a surface;
a beverage dispenser arranged within the frame, comprising:
a multi-serve beverage container for storing a beverage; a dispensing head in communication with the beverage container via a conduit; and
a pressurized vessel configured to contain a pressurized gas in communication with the beverage container so as to drive a flow of the beverage from the beverage container to the dispensing head.
2. The service trolley of claim 1, wherein the dispensing head comprises a bar gun.
3. The service trolley of claim 1, wherein the dispensing head comprises a nozzle
4. The service trolley of claim 1, wherein the beverage container is one of a plurality of beverage containers, and wherein the dispensing head is configured to dispense beverages from the plurality of beverage containers.
5. The service trolley of claim 4, wherein the beverage dispenser further comprises a container support configured to hold the pressurized vessel and the beverage containers.
6. The service trolley of claim 5, wherein the container support comprises one or more rails for slideable connection to an upper end of the frame such that the container support may slide into and out of the frame.

7. The service trolley of claim 4, wherein the container support further comprises a manifold connected to each of the beverage containers and to the pressurized vessel so as to supply the pressurized gas to the beverage containers.
8. The service trolley of claim 1, further comprising a tray dispenser, wherein the tray dispenser comprises:
a platform configured to receive and hold trays in a stacked configuration; a drive mechanism for moving the platform from the lower end toward the upper end of the frame.
9. The service trolley of claim 8, wherein service trolley is an airline service trolley, and wherein the drive mechanism is manually actuated.
10. The service trolley of claim 8, wherein the tray dispenser further comprises a belt connected to the platform and to an actuator, such that when the actuator is operated, the belt moves the platform from the lower end to the upper end of the frame.
11. The service trolley of claim 8, wherein the tray dispenser is arranged on a first side of the frame and the beverage dispenser is arranged on a second side of the frame opposite the first side.
12. A movable beverage dispensing trolley, comprising:
a frame having an upper end opposite a lower end;
a tabletop arranged on the upper end of the frame;
wheels arranged on the lower end of the frame configured to allow the frame to roll on a surface;
a beverage dispenser arranged on the tabletop, comprising:
a platform configured to receive and support beverage containers in an upside-down orientation; and
at least one valve in communication with the beverage containers and configured to control dispensing of a beverage from the beverage containers by a gravitational force.

13. The trolley of claim 12, wherein the tabletop comprises a first end opposite a second end, and wherein the beverage dispenser is arranged centrally on the tabletop between the first end and the second end such that the beverage dispenser is accessible from both the first end and the second end of the frame.
14. The trolley of claim 12, wherein the platform is rotatable about a central post.
15. The trolley of claim 12, wherein the beverage dispenser comprises a first plurality of valves facing toward a first side of the frame and a second plurality of valves facing toward a second side of the frame.
16. The trolley of claim 12, wherein the beverage dispenser comprises a collapsible support.
17. A movable beverage dispensing trolley, comprising:
a frame defining a plurality of receptacles, wherein each of the plurality of receptacles is configured to removably receive a beverage dispensing module or a tray dispensing module;
a tabletop arranged on the upper end of the frame;
wheels arranged on the lower end of the frame configured to allow the frame to roll on a surface; and
wherein the beverage dispensing module, comprises:
a container support for supporting a beverage container containing a beverage and a pressurized vessel containing a pressurized gas; and
a dispensing head for dispensing the beverage from the beverage container, wherein the dispensing head is in communication with the beverage container via a conduit, and wherein the pressurized gas is configured to drive a flow of the beverage from the beverage container to the dispensing head.
18. The trolley of claim 17, further comprising a tray dispensing module, comprising:
a movable platform configured to receive and hold the trays in a stacked configuration; and
a drive mechanism for moving the movable platform from a lower end of the frame to an upper end of the frame.

19. The trolley of claim 17, wherein the frame is configured to removably receive at least two beverage dispensing modules.
20. The trolley of claim 17, wherein the beverage dispensing module further comprises a manifold connected to each of the beverage containers and to the pressurized vessel.