Rigger 3 had rules for just everything, is a safe bet to say it hadcrules for cargo.
They did, in 3rd edition they had Cargo (spare space for stuff) , Load and Design points for the various parts so your engine had so many design points you could use while CF (Cargo Factor) was also spent in most cases.
In 5th it looks like they have merged this with the body score.
For example the Aztech Nightrunner boat in 3rd had a Body of 3 and 14 Cargo and as you modded it the cargo might go down, in 5th the Body score jumps up to 12, from which you now determine your Mod slots from for the various categories.
So it is a bit more streamlined, they just seemed to have left out base Cargo, which is why we were trying to extrapolate it from the Body score seeing as they had merged the two stats.
In fact we lifted the size of Cargo from SR3 pg 133 for our Cargo Slots rough math in the previous post.
CARGO FACTOR
A vehicle’s Cargo Factor (CF) indicates how much space is
available for cargo such as baggage, vehicle modifications or
other material. One point of CF is equivalent to a cube of space
half a meter long on each side (0.125 cubic meters).
So I still feel if you use Body to generate the base Cargo Slots and reduce this as you get certain mods you should be within the ballpark.
Not all Mods should cost you Cargo slots of course and this will be the fun one to decide which do and don't.
However this is not exact as some vehicles by nature of their build will have a lot more Cargo space for their Body so maybe we may have to add in a multiplier for certain things.
So regular cars/speed boats could use Body x1 for Cargo slots but maybe a Cargo Van and vehicles with larger interior spaces would have a x2 or x3 multiplier to figure Cargo slots from.
Following on this idea, the Bulldog in our earlier post might use a x3 multiplier for Body so with a 16 Body they might have 48 Cargo Slots , which would roughly equate to 6 cubic meters of space to play with which is not bad for a 6 seater Long base Van.
If you feel that is too much, then just reduce the multipler to taste. the x2 multiplier gives you 32 Cargo slots which is still 4 cubic meters of space to play with before mods eat into it.
In either case you should be able to take the runner team and still have plenty of room for equipment/drones along for the ride.
Did they clear up the mess about whether an RCC can use Commlink dongles or not? (Haven't made it far into the book yet)
A word search does not have the word dongle turn up but still searching as they may be using a different term.