Cargo Handling covers solutions for the low encumbrance capacity of vehicles (cargo containers, overloading of vehicles) plus a big house rule change for carried vehicles (significantly alters the retrofitted hangar bay attachment). The later is not required to use the former, if you don't like the change.
Please yell at me if you think I've left out someone in the credits section.
Usual Statement: I understand some may not like the added complexity, or the added detail is not needed for their campaign. But, please consider that what may seem complex at first glance (lots of pages) may just be filled with lots of examples and presentation. If you see something that could be a problem for the rules I've presented then please, please comment here. I've play-tested a bit of this, but most of it is very new and yet used. If you do use my rules, please come back for feedback! I will update things as better options or errors are presented. I consider all of these "In Testing".