Back when I had an odyssey & 3k tow trailer, I used adjustable air ride airbags in the coils and a curt anti-sway setup. Towed like a dream, surprised a lot of folks with how well it handled. Only needed to disconnect the bar if i was doing a tight turn backing up.
Rob - what year is your Pacifica? Looks like airbags are available for the current generation: https://www.pacificaforums.com/threads/uas-air-suspension-for-sale-500.42119/
Interesting find. Ours is a 2018.
I just need to do a lot more research before pulling the trigger on anything. I like the idea of Anderson, but I need to see if the PUP can take it. I looked today, it is not C channel. If I had to guess it looks like 1/8" to me.