a taco is great cus its smaller and lighter and more agile but yeah, the new tundras are f#cking psycho beasts...FRICKEN HUGE!!!well i do not want to go shallow mount but i do not have the specs on how much room i have to build and enclosure and by the way, my tundra will eat your liddole taco alive....lol i used to own a taco, good but not great...
personally i'd take a taco cus the new taco's are probably close to the size of the told tundras but the new tundras are just too big for me, haha and honestly just not neccessary for my use...hell, its even bigger than the f150's and other full size trucks...
whatever you do, just do a good job and do that truck some justice...
the choices given should give you a good start..