Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
There are indeed cargo pallets or Jeeps with trailers available for use (but not at the same time). You can select them from a pop-up clipboard or you can choose to have no cargo at all. Whichever option you go with the weight of the aircraft will be adjusted accordingly.
Jeeps??? Now we're talking!!!! The Flight 19 guys might not ever get me out of the "Boxcar".
LOL ... the Jeeps took almost no time to include as they are the ones I made as static objects in the Hobbs airport project I did for Milton many years ago. Ed re-did the textures for me as they needed some TLC for use when viewed at a closer distance (i.e. standing next to them in the cargo hold).




Prepar3D 2017-10-25 23-23-34-114 by Jeremy, on Flickr
There ya go!!