We have always had Sr5. Just got a new one last year. Great utes. We go to alot of remote places and have towed just about everything with it and never had a problem. We have 2 car seats in it. We only need the extension for rear facing, it was about $35 for the extension.

My brother use to have a colorado but not for long, he said he just did not find in comfortable. I never got in it though so I can't judge.