The county town is now Trowbridge but was originally Wilton. There is one city, Salisbury and several towns including Chippenham, Devizes, Royal Wootton Bassett, Swindon and Westbury.

Wiltshire Council

There is no information on the website concerning motorhome parking. There are lots of cp but no height information.
Castle Combe - Dunns Lane cp is available for coaches so maybe motorhomes can park there.

Cotswold Water Park
The only car park without height restrictions is the Gateway Centre.
This is at Spine Road, South Cerney.
This is a very rough car park with many potholes and is a disgrace to the Water Park. We were there in November and the potholes were filled with water so were invisible.
Longer motorhomes may have problems turning unless they have a very good turning circle.

Trowbridge - Lovemead has no height barrier. Not for longer MH.
Salisbury - Park and ride SP5 4DS - All have 8ft height barrier. Britford has an overheight barrier whatever that means. MMM says MH can park in Britford in designated bays next to the terminal building.

Avebury Stone Circle - National Trust. £7 for MH but easy access to stone circle. Small village with pub. HF.

Hackpen Hill - Not far from stone circle with outstanding views. Extensive footpath. HF.

Win Green, Cranbourne Chase, SP7 0ES - slightly potholed but outstanding views. HF.