This service is for shipping anything with a billing weight over 150 lbs (68kg). That can mean one package or multiple packages on one pallet, and the weight can refer to either measured weight or dimensional weight.
Please remember that the weight of the pallet and shipping materials will be added to your rates. FedEx Freight will deliver the pallet right to the sidewalk of a commercial address, but then you are responsible for bringing it inside and unpacking it. Very light or very large packages can come without pallets.
Maximum size for FedEx Freight is 119 x 80 x 70 inches (302 x 203 x 177 cm), maximum weight is 2200 lbs (997 kg).