Scottish camper trip recommendations

[J8 SVG]

Planning a road trip in my friend's Sprinter Camper in April. Planning on seeing Ayrshire, Jura, Isla and Loch Lomand over 4 days then a hotel stay in Edinburgh to finish off the trip

Does anyone have any camper spot recommendations? My partner would rather stay at sites with a shower etc rather than wild camping which I'm fine with as a compromise to driving our car and staying in outrageously expensive shepherds huts and sheds

[GAjon]

We did two nights at Milarrochy Bay Camping and Caravanning Club Site on Loch Lomond a few years ago, it was pretty good.