Why do I not get rates for UPS Freight sometimes on classes 300/400/500?

UPS do not support real-time rating for these classes.

As stated by UPS ‘After researching the issue, when shipping Freight when the class is 300 and above, you would need to contact the Freight Department to obtain the rate. The Freight Rating API will only rate the class of 200 and below.”

Please refer to UPS for further information.