Pretty self explanatory title, but I'd love to see that get added in maybe a patch update. The pre-facelift roamer has that as an option, and putting those on the newer one just looks strange, as it deletes the reverse lights. I think it would also be cool to have all vehicles with a tailgate/liftgate be openable via a key or something. that would make it way easier to use the cargo areas for loads and whatnot. I have no clue how difficult that would be, but I know there was a mod that did that for the roamer a while ago, it hasn't worked for a long time.
