The numbers seem like the work. You'll know it's back there.
Remember that the payload on the truck doesn't include aftermarket items like spray-in bed liners, truck caps, car seats, brush guard, etc. Then estimate what you'll carry in the truck: kids (they're little now, but they'll grow. . . depending on age this could be another 100-250 pounds combined), firewood?, bicycles?. All of these things should be subtracted from payload. I don't know what the ratings include now, but the payload used to count for one 150 pound human on board. If you're like me. . . well. . . I need to add some weight to my "rating" and include DW.
You shouldn't run out of tow capacity, but watch payload. As it stands now, you should be fine, but you could easily overload yourself by continuing to add more stuff to the truck.
Let me echo the advise for:
- Good weight distribution hitch
- Quality sway control
- Brake controller (not timing based)
As a previous poster said, mentally prepare yourself to run at high RPMs, which is exactly what the 5.3L is made to do. You might end up in M5 or M4 running at 2,500-3,800 RPMs or so. The engine can run at 3,500 RPM all day without harming it. Review the torque / horsepower chart for your setup to know where the power is made.
Good luck!
DW, DD (2007), DS (2008), DD (2010), DD (2011), and me
2010 Chevrolet Express 3500 LT
6.0 liter V8 SWB 12-passenger van
2008 Fleetwood Utah Popup Camper