Pfft. Don't pay any attention to these guys. They don't understand that a vehicle can be LIFTED and not only LOWERED. *insert Honda/Nissan fanboy joke here*
I have a mild lift on my Trooper. Springs in back, TBar crank in front and longer travel/heavy duty shocks all around.
Like you, my truck has IFS (blech) so I was very limited. But you have a Tundra; they actually MAKE IFS lift kits for it...you're lucky.
If you've got the money, then go for it!!!! :beer:😎
Remember though, that in addition to actually buying the kit, you've got to factor installation into it...best advice (unless you are VERY mechanically inclined) is to buy a package deal from an off-road store that would include the price of the kit and installation. These kits often do not come with instructions of any kind at all; you have to know what you're doing.