The city of Newport became a city in 2002 and under the Govt reorganisation of 1996 it became a county borough.

Newport City Council

There is a free car park at Coldbath Road, Caerleon which has 8 spaces for coaches but don't know if motorhomes can park there.

Newport - Faulkner Road - 159 spaces no height information.
Newport - Hill Street - 62 spaces no height information.

There are NCP car parks that have NO height restrictions.
Newport NCP - North Street NP20 1JZ - 83 spaces no height restrictions.
Newport NCP - Station Approach NP20 4AT - 44 spaces no height restrictions
Newport NCP - Godfrey Road NP20 4NX - 180 spaces no height restrictions.