Here's a video showing a Jayco trailer being built in 6 hours!!! video here
I'm not so sure that Jayco bragging about their assembly time per trailer is a winning public relations strategy.
How long would the assembly time be if Jayco properly tightened all 4 AC hold down bolts, carefully applied the slide room seam tape, and centered the windows in the hole and used a window sealant more durable than foam tape?
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.