John,
... Yes, had to tighten up some water lines and the drain in the kitchen sink, but nothing major...
HOSS
Funny. I had to tighten the drain under the kitchen sinks, too.
I've got a couple of issues with my new 3670RL, but no show stoppers. Annoyances, more than anything. I was at the RV show down in Quartzsite this last week and browsed through a few other units, including a couple of 'Big Country's and the former other-large-northern-western-state-brand I was considering before the BigHorn. I didn't see anything that offered regrets to my current purchase.
FWIW, I'm a first time 5th owner and, I have to say, the size and weight of this thing do certainly make me pay attention! I put a lot into my truck to make sure it could handle it. Seems to be working fine - but it is big and heavy.
I think the bottom line is you need to get out in it - tweak a few things here and there as you need. If there are issues, now's the time to get them worked out. It's the same thing with a new house, a new boat - there are so many players involved in all the pieces, it's lucky any of it works at all.
I think keeping up with this forum (and others, like RV.NET) are really good things to do to learn what can go wrong and how to avoid it. Learn from other's experiences. Things like dropping the bed on the rails, tire issues, etc. Knowledge is power.
Cheers,
rickb