
It appears that Toyota is hot-weather testing the upcoming 2021 Tundra. Three truck prototypes were spied in Nevada today, and at least one of them was towing a large cargo trailer.
2021 Toyota Tundra
There are two elements that are immediately visible. This crew cab prototype appears to still have the existing cab available on the current Toyota Tundra. Will Toyota updated the cab for the next generation of the Tundra or keep it largely the same? We will have to wait and see.

The prototype is also showing a 6-lug nut pattern on the front and rear hubs. The current Tundra has 5-lug nut hubs.

The 6-lug nut hubs would make sense for the upcoming Tundra if Toyota wants to increase the truck’s payload and towing capacities. This includes upgrading the axles, suspension, hubs, brakes, and more.
Ram did a similar thing when upgrading to the 2019 “DT” generation of the Ram 1500. Ram went from 5-lug to 6-lug hubs and increased their payload and towing capacities.
We expect the upcoming 2021 Toyota Tundra to be powered by a gas/electric hybrid powertrain. It is rumored to be a 3.5-liter turbocharged V6 engine that is mated to an electric motor/battery system.
Here is another Tundra prototype spied in the wild.