I think that shit actually happens and you need to get happy.
Take it where you need to, your description of what they told you says they're tired of servicing you.
Personally, I'd take the three to five minutes and move that arm where I think it should be.
It's a scratch they are willing to fix and a mis adjusted arm. It is NOTHING to be too concerned about. If you can't fix that bed thing, almost anyone else can, dealer or not.
The labor at most rv places aren't rocket surgeons and a percentage of them are transient. A craftsman is a rarity.
Smile, take in five $6 pizzas with you on your first visit, make friends at a different place.
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