Chuck I have seen it done 3 different ways.
One and two as you described. Three is wide open with a double roll bar installed as a stiffener.
In our truck, we did it as you described in option number two and kept some of the original structure as a stiffener to maintain the structural integrity of the cab. I think this is the best option but I admit it is based on a feeling more than a actual structural engineering study. A good engineer could prove that wrong...or not.
It also provides a comfortable demarcation between the living area and what we built as our dinette or cruse party area. If it is me an the boys, we party up there while we are on the road. Or if it is my wife and I, we use it as a nice dinette area for dinners and a drink after a long day to relax.
Either way it works really well for us. The entertainment center back up to one side and the slide is at the other.
Rad
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T2000 Complete (but never finished)
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