GBA, no offence, I know you've got some experience towing, but how much do you have towing a travel trailer?
Dkaz, I'm with you, if you're within legal limits and manufacturer limits, I don't see an issue. Of course a bigger truck will pull a trailer better. How big do you go? Might as well have a one ton dually pulling your trailer.
There's so much more that goes into how a trailer pulls and how safe it is to do so. Weight distribution, hitch weight, speed, aerodynamics, etc. One dude pulling a trailer with a half ton might be safer than the guy with the 3/4 ton just because of how its set up. For reference, my 31' travel trailer pulls better than my previous 23' trailer due to aerodynamics and axle placement.