Interesting topic - I think there are good and bad units with all the manufacturers. I've had three trailers personally and had a bad experience so far with only one of them. The first was made by Outdoors RV and it was a solid camper and I honestly didn't find one thing from the factory that I could complain about. The second was made by Northwood (aka Arctic Fox / Desert Fox) and I had 2 pages of issues. That was from a company that had a solid reputation for quality. Now I have a Keystone and couldn't be happier. I actually expected a little lower quality than that of the the Northwood but so far I haven't had one issue to complain about.
I haven't heard the same about Jayco as you have mentioned but it does shed some light on the customer service the dealerships are providing. I think we all have to understand that a majority of the experiences we have regarding service work is a reflection of the individual dealerships at not necessarily a reflection of the manufacturer. I am concerned though they offered to pickup the unit and then reneged on that offer. What happened there? Is there more to that story?
You didn't mention exactly what is going on with the camper except for the issue with the slide. That sounds like a serious issue that would need to be addressed. What else is going on with it? It's easy to get mad at the manufactorer but a lot of the time its the companies that make the crappy components that are the real issue. For example, in my new trailer there is a "USB Charging Station" that doesn't work in the bedroom. Well I hardly blame Keystone that the component doesn't work. It's a faulty component that does need to be replaced and I guess I could blame Keystone for using that Chinese company that made the component but unfortunantley I don't think we will ever escape cheap Chinese made components unless we're buying a million dollar diesel pusher!