I myself am a Vision Engineer & Technical director and work in exactly what you have said above, I have worked around the world on outside broadcasts and also in studios although I feel an outside broadcast company would be more beneficial for you. The reason being is that you have to rig the trucks for the specific jobs requirements. So for example if it’s a concert or a football match etc you’ll make sure you have enough camera channels, EVS, GFX etc rigged before the truck goes off. It’s an amazing way to learn the engineering of how to rig and how to set up the kit.
I know we have some mentors on here who work for OB companies so I’ll see if I can give them a nudge but just for reference to have a look at their websites a few names are;
If you’d like to know anymore, just let me know.