KW T600 and KW T800 Exhaust help

I have a 96 T600 and 01 T800 both trucks have:
12.7 Detroit's,
Wet kits
Integrated sleepers,
Exhaust runs under the frame.
Stack is behind sleeper.

Question:
How much work would it be to convert to dual exhaust stacks that are behind the sleeper?
I planned to get a factory vertical exhaust bracket that attaches to the frame rail like the passenger side stack.
I need to replace exhaust anyway.
But both trucks have air tanks that run below frame on the drives side frame rail. The air tanks will not allow me to run a crossover pipe below the frame. To the drivers side.
How can I route the exhaust from the passanger side to the drivers side?
Do I need to relocate my air tanks?
Has anyone done this?
I have seen a couple trucks with dual exhaust behind the sleeper but never had a chance to look at the details.
Appreciate you help.