Container question again

So I had my big brake on Friday. I done my first run, 1 40ft up to the Midlands, back lose the empty and get 2 20ft containers, leave the trailer in the yard and finish. Nice day lost of things learned and areas I need to improve.
However here’s my question, the 2 20ft how do they unload the front one, if it’s on a standard trailer and the doors in the middle?

The can’t unless it’s on a splitter trailer
The only other way is to travel to nearest container base and get them swapped around for a price.

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See that’s what I thought, but the place I was working at had there own mini container yard, and one of them Jumbo folk lift things. I was thinking have I mucked up…but they never said if they wanted the doors to be at either end.

Proberly getting lifted off

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