Light duty trucks that are not for hire don't have pay loads. There are add ons that will improve the handling and safety of any truck. I do not know of the kit you mentioned here but if your truck is sitting on the bump stops then you have zero rear suspension travel and that is a safety issue that can be improved with new springs, air bags or Timbren springs.
No man has a good enough memory to be a successful liar. Abraham Lincoln
2016 36FBTS Pinnacle
2016 F350, 6.7, 4x4, DRW, long bed
B & W Companion 5th wheel Hitch