I stayed at a campsite just outside Oban many many years ago, they certainly weren't biker friendly as I recall. Not sure of its name or if it's still on the go.
Probably the Camping and Caravan club site. I think I stayed there also many many moons ago. Nice spot but blighted by rules and people who like rules.
Edit....Nope, just looked it up, it was Oban Caravan Park we stayed at. I also just chatted to Anne about when we went there - it was 1981 apparently.
Seems like yesterday.
Double edit.....I did stay at Torran Bay Hostel a couple of months ago. It also has a campsite and is about 20miles south of Oban. No pub shop or anything much nearby except miles and miles of Loch Awe and the lovely roads around it. But does give the option of Hostel accommodation if required. I did ask the owner (a very nice farmer with a strong vision for his village and area) about hosting bike meets. He was well up for it even when I outlined a proclivity for drunkenness and fires.