I weighed our outfit at our local agricultural seed merchants for a fiver. I had loaded the van for a weeks holiday and as we left I called in to weigh.
Now by using that as our bench mark we load the van simularly each time and are within 50Kgs accurate. On a 2985 Kg gross train weight, which we tow to as we tow a big van at max tow limit forthe car, we have + - 5% of that before the ministry boys get excited. Just for the einstiens amongst us that's plus /minus 149 Kgs.
At that level you normally get a sturn talking to by the boys in blue. Or you could be a smart ass and ask them to provide the calibration certificate for the equipment as I did one time when I was told I was well over the weight. They could not varify that their portable scales were operating right nor had they been calibrated and so their day was over and a red faced team had to return to base to start again.
It's not every day you can get away with it but I knew I was ok for weight having weighed the unit that morning and then using half a tank of petrol put me 30 Kgs below that figure.
Thats a lot of drive through burgers needed to make the weight up !! ??