If your 2010 Pontiac G5 is a sedan then the highest capacity Rhino-Rack roof rack is going to be 110 pounds like with the following rack:
Aero style bars # RRVA118B-2
Feet # RRRLKVA
Fit kit # DK181
However, you will need to determine the capacity of the vehicle roof. This information may be in the owners manual. You will need to go by the lowest rated component, whether that be the roof or the rack. If the canoe weighs less than the lowest rated item then you can carry a canoe.
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