Ok so im a bit confused on the 6500 vs 6800GVW. What does this mean in the sense of how does it affect Payload, or Towing capacity? You can purchase a 2013 Laredo X hemi with a tow package and it will tow 7200lbs, and have a 6500lb GVW, or a 2013 Limited hemi with tow package and tow 7200lbs and have a 6800lb GVW? Im confused on this.
GVWR = Gross Vehicle Weight Rating - how much you can put on its four wheels. This is determined from the frame, engine, suspension, tyres, brakes, &c.
GCVWR = Gross Combined Vehicle Weight Rating. Weight limit of vehicle and towed load (trailer + payload.)
Tongue Weight = The "downforce" on the trailer hitch/tow point. Usually 10% or less of towed weight (typically, a 1,500# tow rating allows for 150# of tongue weight. A 5,000# tow rating can be anywhere between an allowed 200-500# tongue weight - may be more, may be less.) Tongue weight can be changed by positioning of the load on the trailer, even though total weight does not change.
"Dry Weight" = Vehicle, no fuel, no driver, no passengers.
"Wet weight" = Vehicle, full fluids. May include driver.
"Kerb weight"/"Curb weight" = Vehicle, full fluids, unloaded. Typically does not include driver, and usually also considered "wet weight" (I'm thinking back to ground school for wet weight - but wet weight of an airplane usually does not include anything beyond airframe, engine, fuel/fluids.)
"Payload," obviously, is the difference between GVWR & kerb weight.
Can you overload past GVWR? Often, yes - but you'd better have better tyres than OEM, you'd better drive carefully, and you'd damned well better think ahead WRT stops! Being "overweight" (as far as your GVWR) usually makes any roads incidents automatically your fault, since you're not likely to be able to control your vehicle (steering & braking will both suffer.)