Agree with weighing the rig. It is super easy and any CAT scale will give you a good idea, not perfect but easy and convenient. Get the app, drive on and you'll have the results in no time and be on your way for $12.50. You don't even have to get out of your seat... I did ours once when unloaded and once when fully loaded for a comparison and now have a high and low baseline. Now I even know I carry about 340lbs of gear in the toad...
Get er' weighed.