I’ve owned five pickup trucks in my lifetime and they all did the same thing to me after extended periods of driving. It was caused by holding my arms relatively high, as compared to driving an automobile and may have been exacerbated by the upright seating position. It was as though someone was stabbing me high in the back, just below my shoulder, and I’m not exaggerating about the pain.
I sit at my workstation on a pneumatic piston office chair. If you have one, jack it up as far as you can to see if it helps.
I dismantled my Gen 3 Pro, and remounted the system on the base, without the shelves. I don’t recall needing to make any modifications. I found it much more comfortable.
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