I think there are two issues with the 4 hold down bolts on AC's.
1) Perhaps they loosen over time as the gasket compresses. I would caution that it is very easy to tighten these bolts, even when they are tight enough, as the gasket is spongy and easy to compress. Be easy.
2) Sloppy assembly at the factory - or perhaps some QC personnel think that two bolts tightened properly are OK if they are diagonally opposite one another.
With respect to apparent sloppy assembly at the factory, this thread lists new or almost new Jayco's with this issue: 2011 Starcraft, 2011 30.5BHLT, 2011 26BH, 2010 365BHS, 2011 New Jayco (unspecified), 2011 28.5RLS, 2011 33RLDS, 2011 26BH, 2011 26RLS.
I finally got a response from Jayco customer service, after two contacts from me. Here's my question and the response. This was my second contact, and I had replied to the confirmation e-mail I got from Jayco (but had not got an answer to):
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My question: So far, I have not received a reply. My question had to do with the four mounting bolts that hold the AC to the roof of my 2011 Eagle Superlite 28.5RLS trailer. Two of the bolts were completely loose, not even touching the flange that they tighten against. The dealer corrected this -after I reported it to them upon learning of the problem in this thread:
http://www.jaycoowners.com/showthread.php?t=2880. But why was the AC installed like this in the first place?
The Jayco response: Thank you for taking the time to contact us here at Jayco. I'm sorry to hear your A/C bolts were loose. There was an issue a couple of years ago in the Jay Feather product. There is no issue in regards to the Eagle series. Basically this was simply an isolated issue of production error. We build these units with human hands and inspect them with human eyes. We certainly do make mistakes. We are not perfect. This is why we have the 2 year warranty in place so such issues can be taken care of by Jayco after the unit is owned.
Thanks again for contacting us and I wish you many years of trouble free camping.
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From the reports in this thread, I don't think they've got the original problem fixed.