I suggest you go to the Winnebago site and look at the Service Tips for Feb-Mar 2009 entitled New Weight Label - which describes the calculation of CCC. The definition and calculation was changed by the RV industry in 2009 to generally exclude anything characterized as cargo including passengers and tankage. The previous calculation (pre 2009) included much more including 154 lbs time sleeping capacity in the calculation. The new calculation does not. Be careful in comparisons if you have an older RV as under the new calculation, there will appear to be signficantly more capacity.
The Service tips are under Resources-Service-Service Tips on the web site.
09 Journey 39Z