We've had discussions before about our surveying rigs and payload etc has come up, however I couldn't find a recent thread to post this in...
We had to pick up an order of rebar (some of our pinnings are rebar and we use them for some control points), so we got 396 lbs worth of rebar which is cut and bundled for us by the local scrap metal facility.
I pulled my 2005 Silverado, loaded with surveying gear (minus all my wood stakes and a couple things I removed to make room for the rebar order) onto the scales that you have to go across when you enter and leave the facility. When I picked up the paperwork from the attendant inside I asked him if I could find out what my truck weighs to see if it's overloaded. He looked at his screen and said it's just over 6400 lbs/ (that's without me in it - roughly another 180 lbs with my winter gear and boots on).
Once I picked up the load and left I checked the weight rating of the truck and it is exactly 6400 lbs (1310 lbs of payload). So I was about 15 pounds over without me in the truck or the load I took back to the office. After doing the math and adding me and the rebar order I was almost 600 lbs over on that drive to the office.
I will attempt to streamline some of the extras in the truck to get it closer to where it needs to be. I'm not really worried or anything but I thought it was interesting because we have guys on this forum who only use 3/4 tons and then other guys that say they don't understand why we would need anything more than a midsize truck.
I sometimes don't see the office for a few days in a row, that and just for time efficiency reasons I'm not loading the truck with what I need for the days work every morning. I check my stock every few days to make sure I'm good.