interesting... lots of folks at this tundra forum recommending the 4.7L for towing loads in the 3-5K lbs range
4.7 L Towing what size trailer/load - Toyota Tundra Forums : Tundra Solutions Forum
"I have an '03 Sequoia, previously owned an '06 Tundra, and now a 2007 5.7L Tundra.
I fell prey to the temptation of the incredibly powerful 5.7L, but to be honest, I miss the silky smoothness of the 4.7L, and my 5.7L has had problems (vibration).
Don't have 5.7L envy. It is a fine motor for a 1/2 ton pickup!
R/
Kevin"