If you've got a SRW, it should be 20,000lbs minus whatever weight is on the axles (including pin weight of the trailer).
jv, i am still confused as to where you are getting this 20,000 lbs. minus whatever.
a VA DOT officer told me during an inspection, that since my GVWR is 9900 and the trailer is 14,000, total that together and the GVWR was 23,900, that what the legal amount that i could weigh, and even with that, he told me they do not look at wether you are really over weight in what they call
"a hot shot" vehicle.
they look at whether your name is on the truck(for hire), all the lights work, you have a medical card(over 10,000 lbs.) authority, insurance, and if you are running a log book, and if you have a fire exting. that is readily accessible.
he said weight was never a factor.
and please explain what you mean by "pin" weight.
and of course, some states are gonna go by diff. regs. than others.
BTW, my truck is tagged at 25,999 and less, which accomodates the use of the trailer in that weight.
my trailer tag is a permanent tag.