tyre pressures

[molekr]

I have lost my handbook and have just bought a caravan and had a tow bar fitted. Can any one advise me about tyre pressures when towing. My car is a 2012 2.0cdti blue motion sports with 235 45 R17 tyres.
Thanks

[timdave25]

Tyre pressures are listed on the inside of the fuel filler cover.