Clarification on reduced load capacity due to suspension modifications?

I just bought a used 2015 Toyota Tundra. It is a certified preowned with 25,000 miles.
I just noticed a sticker on the drivers door frame that says that the load capacity may be reduced due to modifications to the suspension.
Does anyone know what this could mean?

Also I just discovered that the lights for the gauges don't work unless the parking lights are on.
I turn the knob that controls the brightness and all it works on is the information in the center of the dash.
I plan on taking it back to the dealership to be fixed.
Does anyone know of a quick fix?

 

Welcome from NY.
That sticker is put on by Toyota when they add stuff, ......bed liner, bed mat, running boards etc.

 

I'd sat that's it.
This truck has a topper on it.
Thank you.

 

Welcome from Ontario Canada.

 

Unlikely the topper was included as a port-installed option. Got a pic of the sticker? If it's crudely hand-written, it was added by an aftermarket installer. What suspension modifications were made to the truck?

Welcome from the Texas Hill Country.

 

I do not have the original sticker. I wish I did.
I have tried to find a copy online.
.....
The topper is an add on. I looked closely and the sticker says that the load capacity had been reduced by 80 pounds.
Almost negligible.
Thank you for the infornation.