WRONGS!!!11
their are two basic models of the trailblazer
the short version and the extended version, the 4.2 I6 is standard but on the extended you can get the optional 5.3 V8, LSX style.
i have a 2002 short version with with 4.2 I6, the LTZ trim which is nice, interor is great no complants, comfy and luxerious.
the 4.2 is a desent low purpose engine, I get about 18mpg in the city and 24mpg on the highway
ITs not the best pulling engine, ive pulled a couple trailers, and you can tell their behind it, if your pulling a heavy boat id get the 5.3 with extended version or purhaps the short version with the ls2 in it.
mine has 70k miles on it now and has been trouble free.