Hi Reds,

Welcome to the bolt. Here are a few pretty rough numbers from my 55 second series 3200.

Top of axle housing to frame at rear (measured about 5 inches toward inside of spring) is 5-5/16 inches on left side and 5-3/4 inches on right. The truck has maybe 3-400 pounds of parts in the bed and a wood canopy.

Spring perch to frame in front (measured just outside of spring) is 6 inches.

And from the restoration packet (page 65 of 1955 specifications) the standard platform height for model 3104 and 3204 (which I interpret as the height of bed above the ground) is 25.47 loaded and 27.73 unloaded using 6.70-15-4pr tires front and rear.