You must not have anything loaded if it actually weighs 16k. My 36 MS weighed 18-19k loaded.
It's common knowledge that the ANDERSEN can cause bed deflection because it simply sets on top of the high portion of the corrugation of the thin bed. You hit the brakes with 16-? K and it transforms the weight to the front of the hitch causing the hitch to depress the bed and cause deflection.
2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"