I simply search online for truck scales nearby and find them on Google Maps’ satellite view. Zoom in. If needed I use Street View (little stick figure) and slew around. You’d be surprised how many places little cars with Google cameras on top have driven. My objective is to figure out whether there is room beside the scale for me to drive onto the platform with one side’s wheels off it. (I don’t need to be far off; just off). When I find one I go look at it in person to be sure.
I weigh once with one side on the platform making sure my front and rear wheels are on separate parts of the platform (the front is the Steer platform, the middle is Drive and the aft one is Trailer), then drive around and weigh again with all wheels on it. Now I have axle weights, and a little subtraction will yield the weight of each corner without having to find a special scale. I have managed to weigh with our towed car hooked up and still slip through the tall upside down U gate at the far end.
Almost all CAT scales have rails that won’t let you move off the platform. Others are raised off the ground, so no go. There are plenty of others.
After weighing I adjusted for a fuel tank I would want to fill at some point and what other tanks would do if filled or emptied. Checking tire load limits at various pressures (the mfr’s web site will have a chart for each tire model). I then redistributed cargo outside and repositioned heavy and light things indoors. The last thing I did was take almost everything out of the slides to prevent problems with the mechanisms.
Then I made rules for what I must do before traveling, like no more than 1/3 fresh water, other holding tanks empty, diet before camping, etc.
Hats off to you for weighing each corner. Now you won’t be one of those people who say, “Those darned [brand] tires aren’t worth a flip. I’ve had six blow outs in two years that caused $x gazillion worth of damage.” Blow outs are not caused by defective tires. Every tire is X-rayed. Samples are tortured and taken apart. Blowouts are overloaded or underinflated. Stay under max tire load and all the other limits and inflate for the correct load. Also recognize that it’s supposed to be camping, not a race. You’ll be fine.