I’m about to fab up similar rear tie down anchors myself, because my Kelderman Air Ride conversion prevents any commercially available anchors to fit.
I’m
Doing it like a little set of receiver hitches on the sides.
I’m going to buy 1-1/4” square tube for the anchors, and some square tube they slide into for the part welded to the truck. I’ll drill holes and use pins to hold them, so they can be removed when the camper is off for any length of time.
The over-the-bed-rail stake pocket or clamp on brackets will work. Everyone used to use them.
However, if you’re ok with a little cutting and welding, I’d say make yourself a similar set of front tie down anchors.