Have you looked through the Search Facility? and filtered the results to suit.
------------- XVI yes?
As well is two words!
How does a sage know everything about everything? or does he? or does he just think he does?
Remember, if you buy something you bought it, not brought it.
As an alternative to a seasonal pitch, some camp sites with storage facilities will take van from storage yard and site it on a pitch for you as required, returning to storage after your stay, no need for you to tow.
Obviously depends on how frequently you expect to use van whether that works for you or not.
There are two sites with seasonal pitches near Bala - Pen Y Bont and Ty Isaf. Pen Y Bont is walking distance from Bala, nicely kept but quite crowded; from Ty Isaf you'd need to drive but there's more space as it's just a field on a farm.
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Don't forget to leave a review of the campsites you have visited this year or last!