The metal part that bolts to the frame of your Odyssey with a square tube protruding out from under the bumper is the receiver
The removable piece that goes into the square tube is called the draw bar
(or ball mount). That's what you attach the ball
to. Most draw bars can be installed two ways: with the ball raised up (the rise
) or with the ball lowered down (drop
). You want to choose one with the correct amount of rise or drop (likely rise with a minivan) so that the trailer sits level when hitched up. The photo shows a draw bar in the drop position.
The A-shaped frame piece on the front of the trailer is called the tongue
. The receptacle at the tip of the tongue into which the ball fits is called the coupler
. The hardware on top and inside the coupler that holds it all together is called the coupler latch
This illustration shows a proper level set-up with the draw bar in the drop position. In your case, you will probably have to flip the draw bar the other way so that the drawbar is in the rise position.
I am wondering why you are getting the high-lift axle
? You may have a hard time getting a level set-up with a raised trailer suspension matched with a fairly low minivan hitch. You will probably have to use a draw bar with a lot of rise which may create some issues: (1) it will put more stress on the receiver and drawbar, and (2) it may create interference between the tongue jack and the van's hatch.
You'll want to find out from Casita
what the height of the coupler is on the 16' trailer with and without the high-lift axle
(measurement B in the photo). If the high lift axle puts you way above the level of the receiver tube on your vehicle (measurement A in the photo), you may want to reconsider. Remember that the rear of the van will squat an inch or two under the weight
of the trailer's tongue.