Depending on what you're hauling in your other vehicle you could pull it off. A 3/4 will always tow better than a 1/2, and a 1 ton dually better than a srw. But you'll have to be light and actively manage your load, which you should be doing anyway with a toy hauler.
Not sure what your max rating is, and the 5.3 and your rear end isn't ideal, but it will tow safely.
A toy hauler will be easy to load to any tongue weight you want. Aim for 12-13 and you'll tow fine. But get a tongue scale and weigh it every time.
I have no idea what non full timers are hauling around, but I just hit the CAT scales again this last week loaded ready to camp except for food. 480 lbs is what I recall. That's battery, propane, firewood, charcoal, folding chairs, spices, all kitchen stuff (paper and plastic plates for us), blankets, tools, games, clothes etc. added case of drinks, case of water and 3 bags of groceries for the 3 day weekend the next day.
Just checked, 480 lbs it was, not counting food. So max would of been about 600 lbs over the published (and verified when new) trailer weight. Again, that 600 is including about 40lbs of propane and 48 lb battery.
No matter what you're towing with it will never be safe to just "load and go" without fully knowing your weights. Even more so with a toy hauler. Take actual weights, know your loads, and stay within your limits. Keep it slow and you'll have a safe towing experience. You'll have to tow 9000 at 12.5% tongue weight....it should tow fine, but no guarantee. Don't mask sway, eliminate it by proper loading, and save the anti sway devices for emergencies.