Neither did I until today! Located in Elkhart Indiana, the Recreational Vehicle and Motor Home Hall of Fame has a museum that you can visit too. Check it out at RV/MH HoF
I was following the NMS-South race car trailer upgrades, and then ended up researching various trailer manufacturers. One trailer builder is located near Elkhart IN, and there on the map I spotted the RVMH Hall of Fame. Wow, the things you can learn on the Internet. Or by looking at a map.
Now that I think about it, I've known plenty of people with RVs or MHs, from my parent's used one they travelled in when they retired, or my friend's family that had a classic back in the day, and all the autocrossers and race car folks that travel in their own RVs to camp at events too.