There are also different bolt-on cross members near the rear of the frame, for the Suburban fuel tank.

There are frame body-mounts that are specific to the panel body (in the rear).

Non of these things would make it difficult to mount a 1954 1/2 ton Pickup bed on a 1954 Suburban chassis.

As stated in another recent thread, the big differences in 1/2 ton chassis are between the 1953 and the 1954/55-1st and the 1955-2nd.

Tim