Hello and welcome from Mebane, NC. Yes your envoy will be overloaded. Dry trailer weight is the weight of the trailer without anything in it. On average people tend to add 1000-1500 lbs to a tt (travel trailer). So you are looking at 5600-6100 lbs loaded trailer weight. Ideal loaded tongue weight is 13-15% of the loaded trailer weight. You are looking at 730-915 lbs loaded tongue weight for that tt.
Now let's look at your envoy. Problem number one will be your short wheelbase vs a 30 ft trailer. I pulled a very similar sized trailer (but about 1000 lbs heavier) with an Armada and got pushed and pulled all over the place. Ended up trading for a 3/4 ton diesel truck (overkill but what I wanted at the time).
Problem number two is your tow vehicle (TV) capacities. Your gvwr is 4600. I suspect this leaves you with little to no payload. Look inside your drivers side door jam and you will see a tire loading g sticker. On it will be "occupants and cargo should not exceed x lbs". This is your payload. If the sticker doesn't exist (I'm not sure what year they started those) then check your manual for your payload. Subtract the weight of all passengers, pets and gear that will be in the tv when towing. This will be your available payload. Your loaded tongue weight needs to be less than available payload. Towing capacity is determined by vehicle gcwr minus loaded vehicle weight. If you have a curb weight add the weight of passengers, pets and gear then subtract that weight from the gcwr to get your adjusted towing capacity. You will find yourself over on every aspect with the envoy. Try doing the same calculations with the silverado and you will likely find a better Match.
Not sure where in NC you are but even better is to weigh your vehicle at a
cat scale and hand calculate using actual loaded vehicle weights in the formulas above.
On edit: I see you are in Salisbury. There are CAT scales at the truck stops on 85 in Salisbury and Linwood.
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