A winch.

Aftermarket tires or rims.

One guy put a topper on it, then took it off.

Extra lights on a bull bar (it has factory add on switches)

Weathertech floor mats for mud or snow.

And here's the biggie, mud flaps. The front tires coat the sides of the truck badly. It's cool looking the first time, then it gets really really old.

Not much else!!!