From what i have read and from what i understand Overweight is Overweight wether or not your at fault your insurance company more than likely will not cover you in case of a accident.. Thats just what i gather from reading over on GD about these discussions all the time.. The endorsement will save you a extra ticket if you do get pulled over... but your best surfire bet is to load up like you would for any normal weekend including the 4 30packs you plan on drinking in one night and hit up a scale and see if you definatley are within the weight rating.. You would be surprised how many people go ohhhhh im fine im not over weight, then they go weigh thier rig and are in disbelief because they actually are overweight... I do believe the truckstop over off Blue Diamond and the 15 has a certified scale ( someone might want to verify that ) but usually 7 bucks will give you the real truth and its a couple minutes and can be accomplished on your way to dumont