drsteve wrote:
One can change out tire/rim sizing, spring pack etc to legally increase gvwr.
Stouter springs might keep your bumper off the pavement, but they won't increase the carrying capacity of your axles.
Not sure that this is an issue for "most" 25/35 series truck. Adel tube etc is usually 9000-11,000 lbs. A SW 25 series has tires springs etc good to 6500-7000 lbs. This is not an issue generally speaking.
Also, if an aftermarket bed installer goes over the manufactures axle rating, the warranty will fall into the bed manufacture lap. They will usually check to verify warrant will still be usable. At least on trucks I've had it has worked this way.
Marty