axle bumpers for lowered trucks

[XwalkerX]

so I found these on the brothers website

http://www.brotherstrucks.com/prodin...number=AXB637L

I emailed them this question the other day but I didn't get a response so maybe someone here would know.

currently my truck is lowered 5" in the rear and does not have ANY of these axle bumpers on it. the only time I really notice is when I happen to encounter a large bump once in a while.

so im wondering if these are a smart idea to put on my truck or if they will hinder the axle movement all together?

anyone have experience with these?