2009 Chevy Colorado towing

Engine Performance problem
2009 Chevy Colorado Two Wheel Drive Automatic 25000 miles

2009 Chevy Colorado Crew Cab with Z71 off road package. 5 cylinder 3.7 liter engine.

This truck did not come with the TOW package.
If I simply add a tow hitch (and no other additions such as transmission cooler), what would the tow capacity be?

Thanks.