This discussion comes up fairly frequently and always seems to get more heated than it needs to. The problem is there's a lot of variables (not all of them strictly weight related) that factor in to towing a trailer and so there's a WIDE variety of opinion on which facts or data really matters.
Rather than a suggestion of what you can or cannot do with a "half-ton" truck (really, at this point, a misnomer), your best bet is to take a look at the information available. Remember that not all "half-tons" are created equally (with regards to towing and payload capacity both). Here's some helpful links to check out:
Forest River RV Customer Service
Trailer Towing Guides | Trailer Life Magazine
Ford Towing Guides | The Official Site of Ford Vehicles | Ford.com
Towing Capacity Chart | Vehicle Towing Capacity | GMC
Trailering and Towing | Vehicle Towing Guide | GMC
Trailering Guide - HOME
Dodge Towing Guide
Tow Ratings Database - Tow Vehicle Ratings | Camping Life Magazine
Truck Ratings for RV Towing
Always remember the basic rule of thumb for safe and happy towing: you want more truck than trailer!