Darryl-
Many of us who have installed Extend-a-Stay-type tees have found that the regulator has room to move to accommodate the tee. Sometimes, you have to add an extension to the regulator support to attach the plastic regulator cover, with the regulator in its new position.
Here is a link that shows an installation and an extension. At the bottom of that page is a video of that fellow's installation.
For our coach, adding the Camco tee (link
here) moved the regulator 6 inches to the right. I fabricated an extension about a foot long, made of 1/8-inch black ABS, as in the video. It worked out well.
Look at your coach's tank and regulator and see if you have the room.