Hey,
Welcome to the TruckersMP Forum!
There is a temporary fix however it does cost money. You would have to teleport to Services by pressing F7 and then "Teleport to service", after the cargo spawned.
The trailer will then automatically be connected and then you can go ahead on your journey.
Another option is that you head into single player and get the job, and use the freecam to place yourself somewhere without it costing any money.
However teleporting yourself can only be done in Singleplayer and not multiplayer unless you are GM+. You can still use freecam in multiplayer though.
You can enable freecam by:
Go C:\Users\'PC name'\Documents\Euro Truck Simulator 2
Find config.cfg and open with Notepad
Find 'uset g_developer' and 'uset g_console', then set 0 to 1 (Ctrl+F will be helpful)
Save and exit
And now you can use Freecam in game,
camera 0 = freecam mode, can roaming with Numpad
F9 = locate truck to camera position (teleport)
Hope this helps.
Kind regards,
JamesS014