A 2004 Envoy (3.42 rear) has a tow rating of 5,300 (4WD) and 5,100 (2WD).
A fully loaded 19 CCD is going to weigh about 4,500 pounds. A loaded 22 CCD will weigh about 5,600 pounds.
The payload of a 2004 Envoy is about 1,150 pounds. You will have to add the tongue weight of the trailer (10 - 15% of the trailer weight) to that ... roughly 510 to 795 pounds.
Now your Envoy can handle somewhere between 355 to 640 pounds of weight for you, your passengers and all of your gear.
I was unable to find the GCWR (weight of Envoy and trailer combined) .... but you are probably exceeding that anyway.
I would be looking for a higher rated vehicle.
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