With UPS Freight you are not able to change the rate returned in the request like you can with UPS small package. According to their documentation the rate returned will be dependent on your setup with them, i.e.
- You do not have a negotiated rate contract with UPS Freight, Published rates will be returned
- You have a negotiated rate contract with UPS Freight, your negotiated rate will be returned
We recommend that if you want to increase the rate then you do so with a handling charge on the UPS Freight Carrier itself. e.g.