Your GVWR is dictated by the manufacturer and is mainly due to tires, springs, and axle capacity. Our frames are strong enough, and helper springs might help you handle it a little better, but weight on the axles and tires is still the same.
Now, I can't help but note that if your figures are accurrate, you are ONLY 300lbs over, and that is less than 105% of capacity, and I think you'll be OK!
Now, I can't help but note that if your figures are accurrate, you are ONLY 300lbs over, and that is less than 105% of capacity, and I think you'll be OK!