the police do have a purge now and again with caravans ,a few years back at Easter we were going along the M4 ,and along came a motor cycle cop and indicated for us to pull in the services at Leigh Delamare , as we got in there they had some more Police and 3 engineers checking the vans allthough they didnt check the nose weight ,they checked the lights ,tyres ,and looked under the van ,checked the hitch for movement ,they also looked at our bike rack ,checked the lights ,there was a few vans in front of us and 2 of them were still there when we left ,one of them you could see the nose weight was heavy ,the front of the car was pointing towards the sky ,but it was quite a freindly experience ,the policeman was a caravaner so we had a bit of freindly banter between us