Never had it happen but ... never been in that situation ... understand the OP's frustration tho. I have however had a lot of people camping beside us, so I'm not against density and number of unit rules in CGs.
Just out curiosity I check campsite rules posted online for the provincial and national parks, western Canada. Each one covers number of units per campsite among other things. Bit of a surprise to me, all allow only one sleeping quarter that is motorized or trailered per site. A (ground) tent as a second sleeping quarter is mostly allowed (not uncommon for kids). Granted, these are different, and foreign, jurisdictions and as such the readership may not care a whit. But, it seems to me, rather than some silly pulled out of the air hardship, there must have been some common history behind coming up with this rule and likely that has been experienced elsewhere. And I'm not thinking money grab.
Agree with the don't blame the host sentiment. I've seen the ugly tourist who's been the one giving the hard time. She who's, "camped all over the US and western Canada and never had to pay, bow wow". Usually ineffective, always unpleasant. I like Larry's approach of explaining the unique situation and asking for a re consideration. Presumably the OP does same. Blows if the answer is no.
PR, don't get me started on "the honor system". It's got a lot to answer for ! We have a number of self register CG up here and I used to make a habit of noting who had a receipt on the post. Paid particular attention to the 'Canada Dream' rental types. Had to give up on the practice, doctor's orders. Pet peeve: hearing, "we love flying over to tour around here because... all the camping is free !". Even better if they're driving one of those huge Euro trucks. Because, um, no, not free to this taxpayer it isn't.
