Cricket,
Your Trailblazer has one of the most powerful I6 in Suv's available, so I dont think it would be a problem pulling a
Casita ( proper hitch,
brakes, cooling ) I have pulled my 16ft
Scamp with our old Blazer with the 4.3 litre v6, wouldnt have problem hooking up a 17 footer to it....IMO our 16 ft
Scamp is a bit cramped and that is with 2 people, Think a foot might make a big difference if even it is the bed size