While there have been several discussions about towing a 5.0TA with newer Tundra
, I don't recall seeing (and did not find in a quick search) any other discussion of towing a 5.0 or 5.0TA with a first-generation Tundra
. Since a Frontier (a slightly smaller truck with a much smaller engine) can handle a 5.0TA, it seems reasonable that any Tundra could, but objective data would be better. Do you have specs for your Tundra: curb weight, GCWR, GVWR, GAWR (especially rear)... and how far is it from the back of the cab to the rear axle? Even just a little more description would help: which cab? 4WD?
According to the 2004 Tundra manual, the GCWR with a 4.7L (2UZ-FE
engine) and towing package is 5352 kg or 11,800 pounds, so the towing capacity is 6700 to 7300 pounds, depending on how much of the truck's weight capacity is used up by the cab (there are three cab sizes) and optional 4WD; any Escape in tow will leave a decent amount of the total for passengers and cargo.
It seems unlikely that the Tundra would have any difficulty towing a 21'; a 5.0TA would be within the truck's total weight limit, but there might be issues with payload or clearance to the cab. The Access (extended) Cab and Double (crew) Cab both have the same cab-to-axle space... and it's pretty short, so the pin might need to go behind the axle, which can be difficult to arrange and can cause rear axle load problems. The manual specifically mentions and clearly allows fifth-wheel towing but doesn't list a pin weight limit - that's just a matter of fitting passengers, cargo, the weight of the hitch equipment itself, and the pin weight, within the truck's available payload.