I have just purchased a Chariot Captain XL trailer. Chariot says not to transport it on the roof of a car as the fabric would shred, even if folded and in a transport bag . As we have a Renault Clio taking it IN the car is not an option. Does anyone have any experience of transporting this trailer or advise on car roof boxes which would fit it? If I need a roof box I need to sort it very soon...Grateful for any suggestions!