Originally Posted by Skaling
Plumbing bags with a T is not good practice.. If you ever got into a trailer sway issue while towing, the air in the bags will be able to transfer from side to side adding to body roll. You will also experience this with daily driving. Just my opinion..
Like I said, there are two differing opinions.
If you are towing, you should have a quality WDH and anti-sway control. With the proper set up, you don't have sway and don't have body roll. If you have enough sway that would be rocking the back of the truck and causing body roll than you have HUGE issues that wouldn't be prevented by separate plumbing of your air bags.
Daily driving without significant weight you shouldn't have your bags inflated, therefore no body roll. If you have enough weight to justify airing up your bags, you shouldn't be driving aggressively enough to have any body roll.
Its all about common sense. I drove for 5 years and 60K miles, the majority of it with T fitting in my air bags. Never had any issue at all.