We had a 1/2T and now a 3/4T. For my peace of mind I like the 3/4T, the 1/2T worked OK but I just didn't like the lack of power towing the same TT thru the same mountain passes. BTW milage is the same between the 5.3 and the 6l engines.
I agree that you are just at the limits maybe over some/one or maybe none. I also agree that I wouldn't trade the truck or trailer, either.
I would get good weights and use them to determine what might be capable of upgrading and what may break first.
Example: you may be exceeding the tire's weight limits. That's an easy fix without losing your shirt. You could upgrade to LT (if running Ps). Rotate the Ps back on during the winter when you're not pulling the TT. You're not really out anything, but in a more safe situation.
You might find that the only bad number is the tongue weight. Maybe rear axle. The point is, you don't know until you get to the scales. They will tell you where you can adjust and where you should be more attentive.
Maybe the scales will tell you to go ahead and keep doing towing just as you have been, and you will have a little more peace of mind.
Chuck, Heidi, Jessica & Nicholas
2013 Tiffin Allegro 35QBA
I pull with a 2010 silverado with the same tow package etc.Our trailer weighs in at about 6400lbs loaded and is 29 feet overall. The truck is rated for 9600lbs.We are well within all limits and it does o.k. Sure it slows down in the mountains and with a stiff head wind but no real complains. I think you will be just fine as long as you don;t overload.