Prices are based on maximum of 2 people per unit. (Unit= Per Site) Campsites are per Unit. Max of 2 people per unit. (anyone more than 2 must pay Dry camping price for first person)

Mr and Mrs Smith have an Electric site. Their friend and wife come later and says they are staying with them in RV. They pay Dry Camping Combo price for first person and Weekend ticket for second person. (Note: Day Ticket Holders can not camp, they must be out of park by midnight) 

Mr and Mrs Smith have Primitive site. Their friend and wife come later and says they are staying with them in Tent. They pay Dry Camping Combo price for first person and Weekend ticket for second person.
(Note: Day Ticket Holders can not camp, they must be out of park by midnight)

Mr Smith has Primitive Site, his friend is staying in same tent, He pays Weekend Ticket only, because he is not pitching a second unit and he is the second person in the same unit.
If Friend is staying in another tent or car or (unit) he must pay for Primitive Camping Combo
(Note: Day Ticket Holders can not camp, they must be out of park by midnight)