A large site we have used is Woodhill Park near Cromer. We were there once during a bank holiday and there were a lot of family groups with mixed units including tents caravans and motorhomes on adjoining pitches.
Woodlands grove near Dartmouth is great and depending how many units you have you can reserve a whole bay for your group. We went last August with the family (6 units, mixture of tents, a motor home and a caravan. Booked again for this July. It’s attached to a theme park and campers get free admission.