The Chevy straight 6 was a pretty reliable engine. Has more torque than a V6.
I have a friend that has a 05 Trailblazer and she loves it. Has 135K on it. I've never had one so I can't say from personal experience if they are good or bad. I think it's like any other vehicle, if it's been properly maintained it should last for a long time.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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