What suspension systems are available for a dual axle now?

[rebar]

Hello people..

I might have asked something similar in the past, but I swear I'm serious about this now. lol. I found a trailer builder who will build me a custom 7x16 overland toy hauler which will be loaded to the gills. I want the wheels completely underneath the trailer with wheel wells and was thinking leaf springs, but what else is available for dual axle trailers? I'd love to have adjustable airbags, but independent or axleless might be overkill? I seem to remember seeing a straight axle on airbags with bushings for sway control at one time, but I can't seem to find it now.

Any suggestions from the group would be appreciated.

Edit.. Like this, but stateside.. https://airbagman.com.au/blogs/news-tes ... kit-oa6003