We have been several times, they have for the last few years moved the campground to a different area, and very good it is to, overland ears porn! There are very frequent free busses up to the show ground, just jump on one, you can go back & forth as much as you like.
wandering around the massive campground is something else, you could spend days just doing that.
its all run with typical German efficiency.....not quite like the AO show.
in 2013 they had to evacuate the entire camp ground due to flooding, they were opening some floodgates to save the town and again I think when it had flooded I enter back & only saw one vehicle left( and it was practically floating), the local authorities had jobs, bulldozers etc pulling people out, just in the nick of time.
see this on you tube , there are many other vids just search ab enter all rad 2013
http://youtu.be/CQulLXUkZa8
at about 2.19 in this one I am driving out!
we may come back on the Monday this year, ( is that a b hol?)
andy