First of all, i get the suspension jbeam from kona61's air suspension and i edited it for the newer version of beamng. I also made my own shock absorber for an incredible smooth ride.
This mod will make your ETK 800 & ETK 1300 really comfortable with upgraded variable spring heights and stiffness that you can change in the tuning's tab.
I highly recommend to set the front and rear suspension stiffness under 18,000 for maximum comfort, though you need to increase the car's ride height.
Here's a list on what you get with this mod:
1. Soft Suspension upgrade for both ETK 800 & ETK 1300
2. A smooth V8 engine
3. High Pressure Turbocharger for the V8 Engine
4. A new 4 cyl diesel engine with low rpm but high torque
5. Diesel Turbo S with more psi
6. Muffled Exhaust system for all engines
7. A CVT transmission, that if you pair it with the V8, it will give you extra smoothness