Expandable vehicle chassis and method

1. A vehicle comprising:

a vehicle chassis including a chassis frame having a first frame portion and a second frame portion and being characterized by a length;

said second frame portion being movably mounted with respect to the first frame portion such that the second frame portion is selectively movable fore and aft between a first position and a second position; and

a first vehicle body defining a first interior compartment being mounted with respect to the first frame portion;

wherein the length of the chassis is larger when the second frame portion is in the second position than when the second frame portion is in the first position;

wherein the first vehicle body covers substantially all of the chassis frame when the second frame portion is in the first position; and

wherein at least part of the second frame portion is not covered by the first vehicle body when the second frame portion is in the second position.

2. The vehicle of claim 1 , wherein the first body includes an attachment interface at which an extension unit having a second body defining a second interior compartment is operatively connectable to the first body such that the first interior compartment is contiguous with the second interior compartment.

3. The vehicle of claim 2 , wherein the chassis includes at least one mechanical fastening component that is engageable with a complementary fastening component on the second body to fasten the second body to the second frame portion.

4. The vehicle of claim 2 , further comprising the extension unit operatively connected to the first body such that the first and second interior compartments are contiguous.

5. The vehicle of claim 4 , wherein the chassis includes a first propulsion system mounted with respect to the frame, and wherein the extension unit includes a second propulsion system mounted with respect to the second body.

6. The vehicle of claim 1 , wherein the chassis further includes at least three wheels rotatably mounted with respect to the frame.

7. The vehicle of claim 6 , wherein said at least three wheels includes at least one front wheel rotatably mounted with respect to the first frame portion and at least one rear wheel mounted with respect to the second frame portion; and

wherein movement of the second frame portion relative to the first frame portion causes movement of said at least one rear wheel relative to said at least one front wheel.

8. A method comprising:

providing a vehicle having a vehicle chassis frame and at least three wheels rotatably mounted with respect to the chassis frame, said chassis frame having a first frame portion and a second frame portion movably mounted with respect to the first frame portion, and said vehicle having a first vehicle body mounted with respect to the first frame portion; and

increasing the length of the vehicle chassis by moving the second frame portion with respect to the first frame portion from a retracted position, in which the second portion is substantially entirely covered by the first vehicle body, to an extended position in which at least part of the second portion is uncovered by the first vehicle body.

9. The method of claim 8 , wherein the first vehicle body defines a first interior compartment;

and

wherein the method further comprises operatively connecting a second vehicle body defining a second interior compartment to the first vehicle body such that the first and second interior compartments are contiguous.

10. The vehicle of claim 3 , wherein the first body defines a first opening and the second body defines a second opening; and

wherein the first and second openings are adjacent one another when the second body is operatively connected to the first body at the attachment interface.