To each his own. But I've never been to a campground where the power pole didn't also have a standard 110 receptacle right next to a twist lock. I've never used my 110 30 amp adapter. But I have been to places where there was no twist lock

In a teardrop, I'm not sure how you could seriously be limited by "only" having 20 amp. I guess a coffee maker and AC might be a problem. But that easy to fix....if you're using the coffee maker turn off the AC. You're already outside anyway... I guess you could turn on a space heater and the AC at the same time....but why? To keep the AC from short cycling? OKAY I've done that. I still didn't blow a breaker. It didn't help. My AC still short cycled.
We have a shore power inlet (
http://www.go2marine.com/product/98459F ... et-15a.htm) that works perfectly.. I see a lot of people spending a huge amount of money on electrical systems...is a power control center really necessary? I'm not sure it is when your are looking at what is little more than a power strip on wheels with a parallel 12 volt system for lights and fans.
Again to each his own, but this seems like overkill to me.