Thanks brothers your suggestions and comments are of great help.I did not know that denting and paintining is free from insurency company only parts are shared.
This situation is simlpe and common but we faced this for the first time such a severe damaged. If someone face a very simple thing you naturally turn to those who already nuderwnt such situations as he is not aware of sometimes formalities in such situation.
Another aspect of this sharing is to enlighten other pakwheelers what to do in such situation.
Pakwheels is really a very good learning plateform.
Anyway the driver agreed to pay the damage but requested not to talk to the trailer owner.
Initailly my friend decided to forgive him but later on decided to punish him so that hwe will be careful in future.
Thanks God no causaulties were involved in this accident.