Stopovers with a caravan

This may sound so obvious to some experienced members but my wife and I have been touring in a motorhome for a number of years and have always been able to break longer journeys in lay-bys or large carparks. We have now bought a caravan and have planned our first couple of trips to be short and served mainly by motorway. However, when we travel to Wales and Scotland later this year we will need to break journeys on A roads. Have members any advice about using lay boys with a caravan and are there any recommended stop overs on routes like the A9 north of Perth or the A5 to North Wales? Any recommendations would be gratefully received.