Hey Jerry, I have the same trailer as you. While we are getting ready for our very first camping trip with our trailer this weekend, I don't have a lot of experience obviously, but I'm pretty sure I saw that on ours. I'm sure I had a manual in the bag of manuals that came with our camper. If I don't get a chance to try it out before we leave, I'll test it out this weekend.
Or if you figure it out I'd appreciate the share. Either way, we'll get it figured out.
2015 Jayco Jayflight 28BHBE