If you mean classroom training, no problem. If you mean training in same truck at the same time with a trainer, I think US Express may do that. Few if any other companies do that. To do it means 3 people sharing 1 truck. A semi-truck has about as much space as a small apartment’s bathroom, if it has the minimum space for sink, toilet, and bathtub. Of course the truck has none of those.
Call trucking companies and ask them. If you want to do this you can spend some time calling companies. Your results in this business are proportional to your work ethic & decision making.
You might post the question in the New Driver forum at TheTruckersReport.com. someone will have an answer. Typically husband & wife teams train in the classroom & practice area together, the each get a trainer of the same gender, and get assigned the same truck after training. Companies want teams. I just don’t see why a trainer would do it, as only 1 person can sleep while truck is moving. The top bunk is to be unoccupied while rolling.