I also would never buy into an HOA for all the reasons stated. That said, as I start to age out, I could see myself living in a nice small home, the same color as everyone else's with a nondescript door color and an approved mail box. I won't be able to drive anymore so putting my trailer in front to clean or load up won't be a problem.
Actually, the issue posted by the OP is one of common sense. It isn't as easy as sign the contact and follow the rules. I would hope that if I ever end up in a place like this, the board will have some common sense driven by trying to help others and the concept of working for the common good. Suppose you had a child that lived in a place that had a nuclear accident and the only way for them to get by would be to put their trailer in your driveway. Those who say rules are rules are worse than fools.