Looks like you may need to get a new hitch bar, or perhaps you could
simply turn your old one over.  The trailer and the tow vehicle need to
be level while towing.  U-Haul or some trailer shop should be able to
help you with this.
Leon in Texas

Hi,
You need to get the trailer level.  Towing it with the tail down can
lead to sway.  Also not good if you have to stop fast.

To find out how much drop you need park your tow vehicle and trailer
on level ground. Disconnect them.  Measure from the ground to the top
inside of the receiver. (Say 20 inches)  Now adjust the trailer so it
sits level and measure from the ground to the top of the trailer
coupler on the trailer.  (Say 18 inches)

Subtract 3 inches from the measurement from the top of the trailer
coupler. To make up for the length of the ball.  (Equal 15 inches)
Now subtract this number from the number you got from the ground to
the top of the receiver. (5 inches) That number is the amount of drop
you need to get in your ball mount/drawbar.  They sell bars with
different drops.  You can also get an adjustable bar.

Also there will be a little sag when the tow vehicle is attached to
the trailer so if the number comes out to 4 1/2 inch get a 4 inch drop
ball mount/drawbar to allow for the sag.  Or you could measure the sag
you get with what you have now and just subtract it from the number
you got.  The nose of the trailer *slightly* lower is better then the
tail being higher.

This site will explain it better with pictures.
http://www.hitchesonline.com/drawbars/ball_mount_main.htm

Take care and Happy Campin...

RichA
"We Get Too Soon Olde and Too Late Smart"

Just get a new draw bar with the appropriate offset.  The one we had on
the Nissan had a four inch (or so) "raise" to it, the Durango's is
straight out from the receiver.