You fit it as best you can lol. Some parks only want you on the slab, others don't really mind, and some it depends on the size of the site as to how you set up. We stayed at Dubbo a couple of w/e's ago and ended up spinning the CT after unhitching it, and having the whole lot set up on the slab with rubber mats under the floor. Only reason we did that was the wind was so bad we had to make sure the awning poles were close to the grass so we could peg it out. We find the logistics of the whole placement of the CT is so much harder in CP's.
Other thing you could do is ask for a grass site