"load capacity" is correct and usable in written English.
You could use it to describe the amount of weight a vehicle or machine can handle, such as "This car has a load capacity of 2,000 pounds."
The ladder has a rated load capacity of 250 pounds.
Lochte was asked before the meet about his load capacity.
A train's load capacity is nowhere near as limited as a plane's or an auto's.
"But this is defined by what humans see as useful (load capacity, sure-footedness, etc).
Load capacity is not the only parameter for determining final load capacity of shield.
It has the largest load capacity -- up to 20 pounds -- but it uses less detergent and less bleach.
The increased unit pressure multiplied by a nearly constant area gives a greater load capacity.
"But this is defined by what humans see as useful (load capacity, sure-footedness, etc).
The load capacity of steel columns was quantified.
The criteria used were load capacity, flow rate and stiffness.
Predictions generally agree with the published load capacity.
