Simultaneous Disney reservations?

We will be traveling with another family, and plans just switched to Fort Wilderness because they are bringing their RV and dog. 10 people are allowed on each campsite which is awesome! We’ll be tent camping on their campsite I had the idea of also getting a tent camping site for just one night and getting the dining plan for one day, if we can. All 8 or 9 of us would be on two different reservations for that night. Would that be a problem?

I am assuming that they’ll let us get a one-day dining plan. I’ve read that 3 days is the minimum, and also that people have gotten one-day dining plans.

The thought is to get the deluxe plan and chow down during those two days. Aker. Princess and Biergarten were on the plans anyway.