You can get a 5g pulse for a very short period of time without much trouble just driving along a road without suspension on your trailer. It would be a ransient "spike".
Piston aircraft engine mounts see in excess of 5g when they are started.
Can I ask you to clarify your question....
a) do you have a device which has recorded that your 1600kg has exceeed 5g (sometime)
b) or do you want to have a the 1600kg see a continious 5 g.
c) you want to induce a 5g pulse accelleration/decelleration into the 1600 kg ?
Z