What's the longest/heaviest you would tow with a 1/2 ton?

I towed a 37', 10k trailer for thousands of miles with my Tundra. Biggest difference I made was getting a good hitch. The truck was stable, yes I was overloaded, but never really felt unsafe. I got tired of the horrible gas mileage and made the move to my Ram. I did look at the Titan/Cummins combo, but they were really proud of them. Is the trailer more stable with the 3/4 truck, yes, but if set up correctly, the 1/2 will do well.