I weighed out my rig a couple weeks ago at a certified CAT scale. It was something like $12 for the first weigh and then $2 for each one after that. Slight hassle to run back into the store to pay each time, but no big deal.
Bring a long stick to push the "call" button on the scale. It's up high for truckers to reach out of their cabs. I couldn't reach it without a broom handle.
I weighed 3 times: 1) Truck only, 2) Full rig with weight distribution bars unhooked, and 3) full rig with weight distribution bars connected as per normal. The scale has 3 platforms so it weighs your front wheels, drive wheels, and trailer wheels separately. From those 3 passes over the scale you can figure all the important data. I found out my tongue weight was much higher than I previously thought.
2015 Jayco Jay Flight 32BHDS Elite
Sold - 2007 Jayco Jay Feather 19H
Curt weight distribution hitch with sway control
2004 Ford Super Duty f-250, Bulletproofed 6.0 Powerstroke diesel with SCT chip