I bought both of my trailers from one of the larger national dealers (RV Wholesalers)...  They're actually relatively local for me though (only 60 miles away).
I second the recommendation that you stay a couple days nearby after picking up your trailer so that you can have them correct anything that's wrong right away.  There's no need to stay at a resort park though - in fact, you'll end up testing more of the systems if you don't.  There are often state parks nearby (for RVW, there's one VERY close, although I've not stayed there).