Some add-ons allow you to hual one giant piece of cargo or several smaller items like bricks or similar up to 6 at once. 

Sometimes it is all about efficiency and even Fuel Efficiency and even Freight and Shipping Efficiency and getting the job done as fast as possible ESPECIALLY FOR THOSE QUESTS THAT REQUIRES A LOT OF CARGO AND HALF A CARGO LOT OF SUPPLIES TO BUILD OR REBUILD! I am one of those that likes to get these pain in the arse quests complete and focus on sometimes more useful quests or even unlocking garages and workshops.  Many real life business like Schneider Transportation to FEDEX,USPS,DHL,UPS AND MORE ARE STARTING TO UTILIZIZE THIS TO CUT DOWN ON THE RISING FUEL COSTS AND TO SHIP OR HAUL AS MUCH CARGO AS POSSIBLE TO MAKE THINGS A LOT EASIER! *** I took a course in CBE (Consumer Business Economics) Back in high School and still use what I learned in real life. I put it to use whenever I am shopping as the freshest stuff is towards the back if you didn't know that for an example.*****

Utilizing the Kaizen Philosophy which can implement continuous improvement in small incremental steps for greater efficiency, and higher quality and cutting the carbon footprint. but this is a video game some might argue that this doesn't belong in a game .They are wrong, It does as some Simulators like Snowrunner attract a large percentage of real life jobs like CDL drivers and this can also be used to improve the game overall through its lifespan.

I have not played the game  in a while and was looking at some ideas and well quite frankly cargo hauling needs improving dramatically.

Let"s say you are hauling a massive pipe or even the Rocket from the Amur Region of the Russian Federation, and you want to take the FEM 37 and you can and one giant pipe wile fit in the bed . The cargo will be securely anchored to the bed and will remain semi-permanent in place ,even if you manage to tip the vehicle ! Once you unload you can freely move the cargo  to where you need to.

Well there are already mods for this BUT,  THERE REALLY AREN'T MUCH OPTIONS FOR THE VANILLA GAME ITSELF. THIS NEEDS TO CHANGE.  I included  LINK TO A SITE THAT KIND OF EXPLAINS THE TERMINOLOGY of the word. 

The Vanilla game needs more options for ALL VEHICLES for hauling cargo and cargo slots

What Does Vanilla Mean in Gaming?