I had a similar problem when I got my trailer. '06 197 sport. I installed a pvc 4x4 fence post connected to my rear bumper. I used sealant to put a cap on one end and bungee cords to attach the end that I use. It all fits in there. There are a lot of people that do this mod in various ways. To connect it, just use a few threaded rods, a few thin 1" wide metal strips, a few nuts, and a little rubber sheeting. There are also people that installed this setup under there trailer, but that would be too close to the ground for my liking.
2010 Jeep Wrangler Unlimited
2006 jayco sport 197