Hey Nick that link shows that to be a air system working off the coach air also good luck
I asked about tapping into the tag axle air line and was told to go to the drive axle because the tag air is regulated down.Melbo
Sorry Nick didn't read about that type but a question for you were does the vacuum pump draw from for power I have a vacuum over hydraulic system on my gooseneck and the pump draws from the truck battery and if it is left on in 2 or 3 days the battery is dead good luck