Just a couple extra tips. Don't always trust the paperwork. I had bills that said 23k in the box once and it scaled out at 78k. Between the pressure gauge and just knowing the feel of a heavy load it was instantly obvious I didn't have 23k in the box so I scaled it out. If this happens make sure to give someone a call as they may have put the wrong load on the trailer or other assorted problems like overages and shortages according to the bills. In my case, they just merely put the wrong weight on it.
Also, don't always trust scales at a shipper. They tend to be abused and less maintained. Also many use those raised scales that you can only get one set of axles on. I've always wondered if those can be accurate with only a portion of your truck sitting higher. Anyone know if that affects the accuracy?