I didn't have my Casita
very long, but I did have one guy knock on my door.
It was a BLM ranger, he was checking to see if I was alright. Camped in a foot of snow out in the boonies at 10 degrees below zero. I sheepishly told him I was waiting for some meds for my dog to be delivered to the nearest town (she'd just had surgery and they had to order special medication) and then I was heading south, which was true. I don't like RV parks, I like solitude.
On another note, one time my friend and I tried our best to wave an RV owner down, we followed him for a good 10 miles on a back highway in Utah (by the Big Rock Candy Mtn) honking our horn and waving and flashing our lights
. When we finally got to where we could pass him, we did, and forced him to stop.
He looked kind of freaked, he was driving a huge Class A, towing a small Honda car. I think maybe he thought we were going to rob him. But we told him he had a flat on his car. He jumped out and looked at it, it was down to the rim by then, sparking all over the highway. Not much longer and who knows, he might have even wrecked.
We helped him change the tire, he was an older guy, probably in his 80s. It all ended well.