After towing a 39' 5th wheel for a year or so I learned:
1) If I couldn't see an easy way out from the gate; I'm not pulling in unless
2) I can find a spot to park outside the park and walk in to scope out the site or sites;
If I couldn't see a big wide access and/or couldn't find a spot to stop while I took an investigative stroll through...on to the next CG.
Found quite a few CG's where the access road meant that I had to have one specific, possibly two, sites or I couldn't get in and out with my combo.
State Parks were the usual suspects for places I wanted to go that had smaller sites and access roads, but there was more than one or two "modern" CG's that tended to do the sardine thing that had the same problem.