The left Bumperette is the stock unit and not supplied by 4plus. You can use both with a slight notch modification to the Bumperette under the tire carrier if you wish.
Thule Load bar is one easy solution to get a secure base on the stock rack. My RTT is #130. For winter storage back in the garage sling it with a couple ratchet straps and hoist it up out of the way, the Thule is left attached to the tent.
Here is lighter overall option I went with for general protection off road. Bump It Off Road front skid in lighter steel and Trail Tailor Creeper Skid.