Sorry to hear about your experience.
I have a very similar one with my RV purchase. I got a screaming deal on the unit so I chose to drive 3 hours to get it. They told me I could pick it up on Sunday.
When I got there they told me that since they sold it at such a low price it was a "Tow'n'go"...which meant they gave me no help at all setting up the hitch or walking me through the trailer. No PDI whatsoever.
Anyway...I found the video below very helpful. Your trailer is different, but I am sure there are tons of similarities between the Whitehawk and the Eagle.
Hope this helps:
http://www.youtube.com/watch?v=BPPjbCXPeiw