[BIG CHEVY 3600]

I agree! Doing some measurements I have found:
Frame to floor:
center right 12 3/16" to floor Down 1/2"
center left 12 11/16" to floor

rear right 15 3/8" to floor Down 1/2"
rear left 15 7/8" to floor

Right front bed to style-line is 1/8" lower than right side

Front middle spring eye: left 11 1/2" to floor
right 11 1/4" to floor lower 1/4"
Rear middle spring eye: left 12 1/16" to floor
right 11 3/4 lower 5/16"

Any ideas on this???