Originally Posted by LeeB
My truck has a 5500 GVWR and it is a 2011 Colorado Z71 4x4 Crew Cab...
Your truck has a GVWR of 5300 and an optimistic tow rating of 5,500 pounds. It has a GCWR of 9,500 pounds. But to tow a trailer that weighs 5,500 pounds would mean that your wet aand loaded truck weighs only (9,500 GCWR minus 5,500 trailer =) 4,000 pounds. And I'll guarantee you that your truck weighs a lot more than 4,000 pounds.
No one can answer your question until you load the truck with everything you will have in it when towing; people, pets, tools, jacks, camping supplies, extra fliuds and parts, trailer hitch shank/ball mount/ball, etc., and a full tank of gas. Weigh the wet and loaded truck on a CAT scale.
Subtract the weight of the truck from the GCWR to get max trailer weight you can tow without burning up something in the drivetrain, and without blocking traffic when climbing hills and mountain passes.
Subtract the weight of the wet and loaded truck from the GVWR and that will give you the max hitch weight you can have without overloading the suspension of your pickup.
Your limiter is probably hitch weight. Divide the max hitch weight computed above by 0.15 and the answer is the max GVWR of any TT you should consider.
Post the max trailer weight and max hitch weight you can have, and someone will be glad to search the web looking for suitable TTs.
Based on your tow rating of 5,500 pounds, I would guess that the max trailer weight you could tow without being overloaded is about 4,000 to 4,500 pounds. But that's a WAG, so you need to get the actual weights before anyone can give you a better answer.