Uh, frankly no as this is on an 18 wheeler and the pic is huge when I open it. Can't see whole mount or even how the mount is mounted. But thanks for posting.
What is it you are asking?
You wanted to know if the 3/8 stud is sturdy enough, I post a pic of the very same stud you are asking about, holding up the antenna on a Semi.
If the stud can take the punishment of being driven everyday for hundreds of miles, do you think your little pick em up truck will hurt it?
WHAT IS IT YOU ARE ASKING?