First step is to determine the towing capacity of your truck. Pick-ups typically have a wide range because there are so many variations in drivetrain and equipment. Your owner's manual should get you started, and then if you need to know some of the details of your truck's exact configuration, a Chevy dealer should be able to help you.
Once you know what you can safely pull, the sticky thread Trailer Weights in the Real World
in the General Chat section will give you some data on what many makes and models actually weigh once you load them up for travel. Post #297 links to a spreadsheet of the data- you can filter by make or length and it even calculates average- very helpful!
Another great resource is the Buyers Checklist
. Print it out and take it with you when you go to inspect a used trailer.
Best wishes in your "egg hunt"!