phsycle
Adventurer
The best example I can think of is the Frontier and Titan which are on the same "platform", even though they share very little. It just means that the assembly line steps and flow are the same for each, so they can be built on the same assembly line. But I guess that assembly line could be in Mexico.
The lastest rumors are that the Tundra redesign (in 2022) will have a 3.5l turbo, with a hybrid option... which may also be integrated into the Tacoma (just the hybrid part, not the turbos), so they'd sharing more drivetrain parts than currently. Also, I read that the 10spd transmission in the F150 is the same one the Ranger uses? Maybe the Tacoma and Tundra will also share a new transmission.
A payload upgrade for the Tundra would certainly be nice, but I doubt it will happen.
I can already see people trying to stuff the turbo's in the Tacoma. 3.5T in the Tacoma will be a riot.