DON"T CUT SPRINGS!!!!!!!!!!!
Just as dangerous as all the other points above.
Air shocks and air bags are still considered as an illegal method of supporting a vehicles' minimum ride height as far as the Athorities are concerned.
If an air shock, or even expensive Air Bag systems fail, the vehicle will drop to a level below the legal scrub line.
The only way to overcome this is to set the whole rig up without rubber on the rims, remove any Air shocks/air bags etc and have all your suspension sitting on the bump stops.
There must be clearance under the whole chassis/suspension.
Any combination can then be fitted from here to raise the vehicles' frame to the desired ride height with some legislation over minimum clearance between bump stops.