I try to do everything by the book, correct noseweight, tyre pressures, not overloading the caravan etc. However I have never weighed my caravan(or car) and would be grateful if anyone out there knows where there is a public weighbridge in Staffordshire.
Most gravel pits or quarries will weigh it for you, some may ask you to pay if you want them to provide you with a ticket showing the weight.
You could ask your local council office for the public weighbridges in your area or you could call in & ask at any commercial vehicle dealerships, they should weigh new vehicles for taxation & will know where weighbridges are.
If you have a vehicle check point operated by VOSA they'll weigh the unit for you. It's a long while since I was up in Staffordshire but is there not one just by J15 in the old Pandora yard?