UPS Production Access

I requested a developer access key from UPS and the calculation of shipping charges seems to be working okay. The email I received from UPS with my access key said for some APIs it was only for testing. These APIs were for

Pickup - Ground Freight
Rating - Ground Freight
Shipping - Ground Freight

Is there any benefit to requesting another key for these APIs? What exactly is Ground Freight?

Freight (LTL) shipping is required if a single package weighs more than 150 lbs.  The nopCommerce UPS plugin does not support freight  (only the methods as listed on the configuration page).