1994 GMC Suburban Owner's Manual - Page 306

Never exceed the GVWR for your vehicle, or the GAWR for eitherthe front or rear axle. And, if you do have a heavy load, you should spread it out. Using heavier suspension components to getadded durability might not change your weight ratings, Ask your dealer tohelp you load your vehicle the right way. NOTICE: Your warranty does not cover parts or components that fail because of overloading. If you put things inside your vehicle-like suitcases, tools, packages, or anything else-they go as fast as the vehicle goes. If you have to stop or turn quickly, or if there is a crash, they'll keep going. 6-60