Second the Antlers recommendation. We have only stayed there early in the season (first week in June) and it works well. Moorage is available too. It might be too late to make reservations for peak season and last year, Antlers was dry late in the season due to the low water levels.
Holiday Harbor has a few spots with full hook-ups, it is nothing fancy, but who cares if you have the trailer and are on the lake all day. For the most part, Holiday is also centrally located on the lake. Just don't attempt to take your set-up down to the marina without unhooking the boat in the upper parking lot!! It wouldn't be a good way to start the trip.