You are generally pretty safe if the GVWR of the trailer you are considering is no more than the factory tow rating of the truck you want to use.
So if the tow rating on the Colorado is 5000lbs look for a trailer with a GVWR of 5000lbs or less.
My logic behind this is, even though you really can't reach the truck's tow rating going by the numbers, the trailer will weigh something less than its GVWR loaded and ready to camp. Everything meets in the middle in a cloud of blissful ignorance where you and your family heads off to the campground on a Friday afternoon, have a wonderful weekend, and head back Sunday morning with nary a care in the world. It works for the hundreds of thousands of trailer owners that don't use this forum, so it should work for you.
Putting 10-ply tires on half ton trucks since aught-four.