Not so much ‘air suspension’ as such, … apologies I realise my post probably assumes a minimum level of familiarity with the Range Rover. The original suspension has coil springs and conventional dampers supplemented by a central ‘sprung’ A-frame. The A-frame/Boge strut assembly allowed the regular suspension to be pliant/soft because it compensated for any additional load (whether in vehicle or on the towbar) by pressurising the central Boge strut (self adjusting hydraulic/high pressure nitrogen) which once the vehicle was under way either pumped up the strut or released pressure to maintain ride height, but at the same time maintaining a good ride quality.
The Scania items referred to above are (potentially) to replace the Boge strut in the A-frame assembly rather than conventional air suspension. I have regular air suspension in a later model, but the attraction of this system is that it is much simpler, and a failure isn’t a showstopper.