I have a 46 1.5 ton flatbed with the dual rear wheels.
I took it to a truck stop and had it weighed and they gave me an 'offical' ticket with the weight on it.
Mine was 5180 pounds with my fat butt in it.
So subtract about 225#, uh, OK, OK, subtract
245# and that gives you the weight.
But, the main thing, try a truck stop.