It's been my experience that some parks... even when renovated... simply do not want big rigs, and that's ok too.
There's a park like that not too far from where i live. When I asked the owner one time, why they didn't make a full pull-thru 50-amp sites when they redid the place a year ago, they told me that they simply wanted to keep their park small & intimate.
His reasons were varied but some were...
* to make space for larger rigs, though they bring in more money per site... he'd have had to lose more than the equivalent number of small sites to make up for it. For every 2 long big-rig sites, he could heave 3 smaller sites... plus would lose another smaller site due to having to make the roads & curves wider to accommodate the length of the longer rigs.
* people in smaller campers tend to be outside more... whereas people in larger, more comforatble rigs tend to stay inside more. When they do this, they burn more electricity using their AC units, powering TV's, etc.
Bottom line was that... if he was building a completely new park from scratch, that'd be one thing. But in redoing his existing place, he said he didn't think he could be as profitable as he was already... that the return on his costs for the upgrades he'd have had to make to the entire campground layout, to increase the power grid, and to upgrade the plumbing to account for increased water use, etc. wouldn't be as much as it already is.
Can't say I blame him for that.