I think someone added those tubes/bars judging by the welding & angle iron....why? IDK lol...
Your bike in my opinion is a pure RTS. That roll bar,seat,front tire ect. ect. I see no fender mounts on the rear,the SL has a different headrest roll bar..ect. ect. But maybe someone once was trying to convert it to a street legal trike,ya never know.
Here's a pic of a very original RTS-SL,,you can see all the differences and pieces missing
Sorry...guess the site is still having photo issues...I can't upload one