Sites in Britanny near resorts/towns

Roblyn

We are planning a touring holiday in Britanny this year with our 8m motorhome.  Obviously it will be too large to use for travelling around on a daily basis and I would be grateful for any site recommendations that are within walking distance of resorts/towns
that would be suitable for 2 almost-pensioners - one with limited mobility (one new knee but need a second) or sites with good public transport links.

Many thanks.