If you've ever been camping at RV parks, there is limited privacy and especially if you have kids, if two campsites are next to each other outside, they are absolutely going to be listening in on each other, because there's not much else to do.

Also same with watching people pull in to their spot. As someone who regularly RV camps, everyone watches everyone pull in and also pack up to see how efficient they can do it vs themselves. It's like a pasttime, especially if you get lucky and catch someone who has to try 10+ times to line up the RV correctly, because you know they just rented a bunch of equipment and don't really understand how to use any of it.

TL;DR; it feels like you're complaining about someone being thoughtful and wanting to pay it forward at an RV park by telling someone else, one father to another, that they're doing a good job at life. Guys don't get positive reinforcement a lot, so I bet this meant the world to the father who received the note.