Well, the manufacturer provides 2 weights on vehicles, the curb (completely empty and dry) weight and the Gross Vehicle Weight Rating. The GVWR is the maximum weight the vehicle can be. Yours will be somewhere in between depending on optional equipment, fluids (oil, fuel, coolant etc) and the passenger/cargo load. The manufacturer will also know what the weight distribution is between the front and rear axles at the curb weight, but the actual axle weights will vary based on how the vehicle is loaded. So you can get a a rough idea of how much is on each axle, but it's best just to load the vehicle how it would normally be loaded and go weight each axle to get the best numbers.
I might be able to help you with those weights if you could tell me what year, make, model and trim level your toad is.
1999 HR Navigator 42DSS
2008 Jeep Wrangler X Unlimited