I would add to those referencing the trucks rear axle.
RAWR= the lessor of the tire/wheel or rear suspension. The axle itself is the big 11.5" AAM unit rated around 10800 lbs so no problems with it.
Bags will cure suspension issues and 19.5" wheel and tires will fix the other part.
A bit about your 3500 GM weights. These new trucks are heavy. Many 350/3500 SRW owners report their empty trucks rear axles are weighing in the 3400 lb range leaving around 3500-3600 lb payload in the bed.
Now add a 20 % of the trailers wet weight = 3600-4000 lb range and the trucks rear axle is overloaded before you put the hitch in the bed and other necessary junk. I normally don't tell folks if their safe or unsafe so lets just say the OEM truck isn't rated to carry that much weight...... without mods.
That trailer is in one ton DRW country.
