Are those the HD rests?
Can your wife put "weight" on them?
My wife likes to use the backrest as a lift point when we see a bump. I added speaker pods and mounted them up against the backrest to give it added support because of that.
Yes they are, HD. . They will easily support her arms, I would recommend putting her weight on them.
Most of the time, your already across the bump before you can react quick enough anyway. They say the fitment is not for CVO,
all I had to do was to notch out two screw access holes to run the tour pack bolts though.