My experience with ARAMARK's reservtion system was terribly disappointing three years ago. A friend and I rented an RV for a week thinking we'd have two days at one of the interior camping areas of the park during the early summer, which was limited to hard side vehicles due to the wildlife that had been frequenting the area at night (and during the day in some cases.) I made reservtions using ARAMARK's web site, but unfortunately did not take a copy of the reservtion with me (dumb, dumb, dumb !) Upon arriving (close to the deadline for our reservation expiring), ARAMARK insisted that I had no reservtion and that only the general camping area was available.
When I got back I sent them a scathing e-mail and proof of my reservtion.....their apologies & the refund were hardly worth my effort. In my opinion, it was inexcuseable, and I have to wonder whose friend took our place.
I CAN recommend the 12 hour bus trip that goes to the end of the road and back if you are looking for wildlife, as long as you realize that you will be sitting on a school bus seat on a very bouncy road, with dust coming thru the windows. Saw several bears and moose, even a fox.