We travelled from Cartagena to Almerima yesterday in Spain and the attendant charged us a Class 4. We are 3.5t, 6..5 long,2.95 high and not a twin or tag axle. I've tried to find out what we should have been. We drove 44 kilometres on the AP7. I told her we are Autocaravan, I had to say it 3 times as she didn't understand me but just said Si and Bali, which means yes ok and waved me through. I think we're class 2 and should have paid less. What can I do in the future to put it to the attendant we are class 2 and should pay less. I'm not too worried this time as it wasn't much but on the higher priced tolls it would be a lot more ?