Towbar electric on s40/v40 , 1996 - 2004 can be routed directly from rear lights, no other drivers or interfaces are needed. Also you can find grey 4-pole connector with permanent supply, switched supply, ground and brake light, at the LH rear light. Don't forget to replace flasher relay with stronger one, and maybe route extra contact and wire from C2 terminal on flasher, to instrument cluster for trailer flasher control light.
One minor thing of OEM wiring harness is some relay in the middle, that cuts out the car's foglight, so that it lits only on trailer.
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