Camping at waylands is illegal and you can be prosecuted.
But you could just wait till night then pitch, i have. hehe.
Theres a million and one places to camp without being seen in that area.

Solstice week is a busy week at waylands, so if you must camp there, please be considerate to the other visitors, (basically dont be a twat).
Also watch your car, the road to the barrow is closed for the last mile or so and the local scallie's like to trawl the area for your belongings.

If you've never been there, its a magical place that leaves a lasting impression on everyone, please contribute to that being a positive one for everyone you meet.