The problem I am running into is that I cannot find a cargo volume value that makes sense. In Rigger Black Book (RBB), you have a base value for the cab, then you pick an option for the cargo area. That is kind of cool, but RBB also uses some kind of hand-waving mechanic for the CF(cargo factor) to CF(cubic feet) ratio.
Enter Rigger 2 and Rigger 3, which at least stat out cargo in mass and volume. Problem is, the stats don't agree. The Roadmaster has the same stats, but the City master and Mobmaster in R2 have less than half the cargo volume of R3!
Then there are the DocWagon variants. My copy of R3 is telling me that a DW Citymaster has 4 times the internal cargo volume of a stock Roadmaster...

Please, someone, help me make sense of this!
ed_209a