Nputtick - SUPLEX has set up the initial spring rate to suit all weights of Morgan, thus the ride quality between a light 4/4 and a heavy Roadster is very difficult to tell apart. The rising rate spring comes in pretty quickly in a bump or hard cornering and that again feels the same for all car weights to limit roll and full bump events.
SUPLEX also worked with Bilstein in their UK Tech Centre to set up the dampers for road work, either just pottering along a bumpy back street or fast 'A' road work, again to suit all weights of car. These are non-adjustable monotube dampers so have a more controlled characteristic that is difficult to achieve with even good quality adjustables. Also of course these Bilstein non-adjustable dampers give the owner a good combination of ride and handling without needing to be adjusted for different usage or heaven forbid 'mal-adjusted', as if anybody would. The Bilsteins are gas pressurised to prevent cavitation that would otherwise reduce damping over large bumps and have a sealed separator piston in the tube that keeps the gas and oil apart to avoid foaming and thus loss of damping when worked hard, something not fitted in most cheap dampers.
So a lot of development work and highly sophisicated dampers in the kit. I trust this helps - PJB.