If you are going to all that trouble, Just make up your own lightbar with 24 volt bulbs
and a long feeder wire for draping from the back of the toad to the bus.
Or spend the $35 and make up a 24 to 12 volt relay system which will combine the turn and tails
together so any trailer type lights can be used. ( get 25 feet of trailer wire too ! )
I have a set of LED trailer lights wired up with clamps on each light that I move around as needed.
The only extra wire you will need is a 12 volt tap (wire) running to the back of the bus to feed the relays.
It's so complicated you only need to do it One Time.....