I know my truck weighs 7300 lbs, I weighed it after I did the solid axle. Not sure what the trailer will weigh though, but I'm using 4500 to be safe. It probably weighs less than that... 26' gooseneck equipment trailer, 8k axles, 17.5s. I'll weigh it soon after I get it. My tractor isn't much of an issue as it's only like 6000lbs with the FEL and bush hog on it. However, the Bobcat 337 mini ex (that I will hopefully own soon) is 11,300 lbs. So 24k should be plenty.
I didn't think I would ever have to stop at a weigh station (unless directed to do so by a DOT man, which has happened to me), but glad to hear it from others. I just kinda wanted to make sure I wasn't missing anything. I'll be making a trip to GA soon to pick up the mini-ex and wanted to make sure I crossed my "T's and dotted my....lower case "j"s 
I'm with [USER=6153]@Paul[/USER] paying for the tag once a year will likely cost me less than one overweight ticket would! I got one in 2008 for 6500lbs over...it was 650 bucks, or something like that.