First of all, I would like to welcome you to iRV2 .com
You have gotten a lot of good ideas to prepare your van. A couple things you should check are the exact weight of your trailer. You can do that by looking at the information sticker under the sink. We owned a 99 Bayside it was 3400 lbs loaded the Santa Fe is bigger I believe. so check it. The other thing I always see is a camper going down the street not level. The easiest way to do that is to check the height of the hitch on the trailer when its level measure from the ground to the top of the hitch, and then when you put the trailer on your van check that height again to be sure your still close. if you are way down you may want to consider a weight distribution hitch. we used on on our Bayside and upgraded it for our old Toy hauler. It helps a lot we never had to worry about it. when a big truck passed us it never swayed.
Just a couple more thing to think about.
One thing I was told a long time ago is you can never be to safe.