[petrel]

Wow, thanks so much for all the information. She hopes to purchase an '08 Wrangler Unlimited "X" 4-door. I like the wiring harness option.

Yes, I refuse to alter the truck's air system. After sending SMI a photo of my truck's tractor protection valve, they agreed that their onboard system would not be necessary. However, it remains to be seen if they will be willing to sell me a system sans their coach air protection system, and stand behind it.

It looks like I can remove the 1/4" male quick disconnect from their air line and replace it with a glad hand for the service side. Then rig up another glad hand with a plug to block the supply line. If I have a toad airline break, or a true break away, the TPV will take care of any leak down and maintain truck brake control.

Thanks again for your help.