I posted on this topic in the past, here;Interest in Custom AV Bed Rack?
and as a refresher;
Hey Fellow AVER's,
I do not remember if I posted this or not in the past, but I think it may have some useful information when it comes to questions about the weight capacity of the hard cover panels. I had sent that question to The General when researching my purchase and this was their response:
"" Thank you for contacting Chevrolet! Congratulations for selecting the new Chevy Avalanche. This is one of the most exciting new vehicles to enter the truck market in years. The Avalanche has won many awards including Truck of the Year from Motor Trend, "Best of What Is New Grand Award" from Popular Science, and ?Most Wanted Vehicle" Award-Pickup from Edmunds.com.
The answer for your specific question is: each bed cover panel is rated to hold 250 pounds weight applied at a single point. The bed panels are made of PROTEC composite material. This is a proprietary formula owned by GM jointly with Dow Chemical, and is also used to make the wings for the F-18 "Hornet" fighter plane! At the core of the panels is a thin sheet of a high tech formula of aluminum commonly called "memory metal." This is used by the aircraft industry for the floors and other surfaces of many aircraft. It helps your Avalanche cargo panels regain their original shape after bearing a load, such as a person or cooler sitting on one panel at a tailgate party.
Please take a test drive of an Avalanche and ask to see page 2-73 in the owners' manual for this information about the cargo panel's weight capacity.
Please keep in mind that these panels are not intended to be an everyday cargo load-bearing surface. There is a danger of a load entering the passenger compartment through the rear window if this is attempted. Ask your dealer to show you the cautionary materials from the factory about this subject. The bed well of the Avalanche is 22 inches deep. This is almost 3 inches more then the industry standard for a pickup truck bed. ""
I personally (6'-3", 245 lbs) have "walked" around on the installed hard cover panels showing off to some of my buddies at work and there was no adverse effect on the panels. You can see alot farther.....