Dave I cant believe you just said you are thinking of running your van overweight, the law is there for a reason! brakes, steering etc do not react as well, you will be a danger on the road, you may as well just say i think im going to drink drive tonight!!
A couple of years back i unknowingly drove someones truck overweight i was stopped read the riot act was told all the reasons why not to overload and cautioned as it was my 1st offence, next time they will throw the book at me, i think the fines run into thousands so DONT DO IT!!
stu