Ok, I submit! I re-reread the fees page from the link you quote, and it does say:
Current Idaho RV Registration Holders
Reservation fees are waived for Idaho residents who have current, valid Idaho RV registration stickers. Reservation fees for these customers are paid for by a grant from the Idaho RV Program. Proof of registration is required at time of arrival.
And...
Note: Prices below do not include MVEF (Motor Vehicle Entrance Fee), prices in the high end of range include additional fees for popular destination parks, premium camp sites and non-residents. Discounts may apply for MVEF or Idaho Residents.
but danged if I can find any place that specifies how much those fees are, and I'm not gonna create an out of state profile on Reserve America to find out!
Thanks for setting me straight.
I still hope you all had a good time! :)
CC