dogman dan
1 PW

One way to strengthen a seat post rack enough to carry 50 pounds of touring gear, battery, etc. The two pieces of silver metal make a strong triangle, eliminating swivel, waggle, and most particularly bending and breaking seat posts.
It will handle for shit carrying that much, but the rack and post won't break. And yes,, I have ridden home with a battery, seat, and rack in one hand, after it snapped the post.
So YES, you can use a seatpost rack on a Full Suspension bike, once you modify it so its NOT a seatpost rack anymore.