No real MH experience answers coming in.
I have heard of it being added to MH, and to me would make sense to have them. I put Firestone's in my TV, this spring. The instruction book mentioned a few different ways to plumb them. For my TV I used a Tee and have both air bags use one fill port and self balance. However, the instructions and I have heard of people, run each bag independently and run different PSI in each bag to balance/level the load. As you may have noticed sometimes one side will sag a bit more, I think due to the large main slide side especially if there is a residential frig in it. So don't think you have to run equal pressure on both sides.
I had no reference to what pressure for you to start off at. In my case I took a couple measurements. I started with what I thought was too hi of pressure of 40 psi, and each trip I changed pressures around to I found something that seams comfortable. For me in my TV 20-25 seams nice, with the TT attached and I run 5-10 without any payload.
Good Luck
Best of Luck