New to tanker, overweight tandem axles

If it's a single compartment trailer, you're screwed. You'll have to take it back to the shipper.

 

I've been in that situation. The way I got away with it is to tap the brakes hard enough to get the liquid surging pretty hard just before pulling on the scales. This way, when you pull on the scales, usually the scale master will give you the green light; otherwise you might sit there for 30 minutes waiting for it to calm down. You're under gross, so should be ok.

 

Did you let it settle before weight was checked? If it was moving the scale may be inaccurate.

 

Run it....there is nothing wrong.

 

I ran 48 states and Canada with loads like that and never had a problem at the scales.

 

Not enough information to make that determination. If the GVWR on the steer is 14k or greater, and the tires are 7k or greater, the steer is not over.

Any axle can weigh 20k as long as the GVWR and the tires on that axle can accommodate the weight.