I am a new user to this forum, so please excuse my ignorance if I'm missing something...

1. I noticed there are lots of dry freight type trucking companys listed... any section for tankers?

2. I just bought a new Volvo. It seems the center pin of the pigtail is being used for ABS (or something) by the tractor. The trailer I pull (a tanker) needs to have 12v available on the center pin of the pigtail during the loading process only, while all other circuits are off. After loading is complete, the 12v can be turned off.
Anyone know of a good way to accomplish this short of putting another 7-way plug (with only 12v on the center pin) on the back of the tractor and moving the tractor end of the pigtail to this plug before loading, then moving it back to the original 7-way after loading is complete?