Tripods have no specs that are relevant in their spec sheets or advertising. So one has to experiment. All tripods can support pretty heavy cameras, a paper drinking straw can support 30 lbs if perfectly balanced and a compact load directly over its axis. Strength is not a problem but it touted as an important spec. What you are more interested in damping(vibration dissipation), torque(twisting moment), and resonances. Being perfectly rigid might be the opposite of what you need. What is it is used where there is ground vibration such as near a waterfall or a race track? How rigidity works against you by transmitting more vibration up the length of the tripod can be worse for image blur than a more compliant, damped design. The same materials straight through are thought to be "strongest" but they also transmit vibration most effectively. Any discontinuity in materials, barriers of different damping rates is very effective in reducing transmission. A non-rigid tripod in many cases converts the vibration energy to movement at a different rate and if slower a rate than your shutter speed, will deliver sharper images with less vibration induced blur but manufacturers don't tell you that. What has a slower time constant for vibration propagation, a carbon fiber tube or a feather pillow is an extreme comparison but shows the importance of transmission characteristics. In a high vibration environment, a feather pillow supporting the camera beats the $2000 carbon super strong tripod every single time.
There are other vibrations to consider. The resonate frequency of the legs means when energy is added, maybe from wind or vibration, a high Q structure will vibrate at its own frequency determined by the length and propagation speed of the material. As a result in some shutter speeds just turn out blurry when in the same conditions others don't.
I would look for a tripod that has coupling between leg segments that are made of a different material or even leg segments of different material. That difference in transmission characteristic causes less efficient transmission of energy(vibration) up the structure. Like is an acoustic treatment of a room to make it very quiet like a studio recording room or sound stage, to reduce transmission of sound through walls, you use a mix of layers of materials which transmit vibration very differently. If the same thickness of any one material was compared, say a 6 in thick wall, compared to the transmission of sound of a 3in thick wall that was made of layers of different materials and air gaps, the wall with different materials will be more effective in stopping sound leakage or transmission. I talked to an engineer for a tripod company which was touting the first carbon fiber camera support systems(for film industry) and he could not answer the questions about damping and it apparently was not tested for.That first model got a bad rep because cameramen saw the poor performance in vibration suppression very quickly. A flexible system that has a low frequency of resonance, even suspended by rubber cords could, for some shutter speeds, perform much better than a super rigid whiz-bang all carbon big buck tripod. Use one in controlled high vibration conditions and compare to others is about all we photographers can go by. You can get an idea of vibration by taping the legs with your keys or a pen and listen to what sound is made...a quiet thud or a sharp sounding "tink". Go with the thud.