2004 tahoe 2wd 4.8L

When driving over hills or bigger bumps in the road feels like bump stops or some thing hitting floor of truck in the rear end. Tends to be a lot worse when back of truck has weight in it.

Is this the trucks suspension traveling to far and hitting a bump stop?
If so what can help the truck from bottomming out?
Shocks?

I don't believe this truck is air ride. I know some tahoe came with it.

Thanks for any tips or advice.
I do realize its small but I have found people on forum can be very helpful.

 

I have Bilstien shocks and AirLift coil bags on mine to help with sag when towing. With only a few psi of air, the coil bags help stiffen up the rear a bit without lifting it for everyday use.