A household that carries gear on the roof has different questions from a household that only needs seats. The question is not whether a model line is large enough in general. The question is whether this car, with this rack and this load, fits the spaces the household uses every week.
Start With the Load
Write down what goes up. A bicycle, a roof box, a kayak, and a ski bag each put a different weight and shape on the roof. Note how often the load goes on and off, and who lifts it. A rack has a stated load limit, but the figure to plan around is the one printed for your specific rack, checked against the roof rating in the owner's manual for the model year you are considering. Where the two disagree, plan around the lower one and confirm it with the manual.
Measure the Roof Rails
Roof attachments depend on the roof. Some vehicles have factory rails, some have bare roofs with mounting points, and some have raised rails. Equipment can change between model years, so confirm which type the model line uses in the year you are looking at. Check the rail spacing against the rack's clamp range, and check the crossbar length against the load. Ask whether the rack maker lists that model line by name.
Check the Garage Height
Measure the opening, then add the rack and the load. A roof box that clears a door frame empty may not clear it when loaded. A bicycle hanging from a rear rack can strike a garage door track or a carport beam when the hatch opens. Walk the route from the parking space to the garage, the drive-through, and any low barrier you pass often, and write down the loaded height at each point.
Check the Rear Opening
A hatch or tailgate with a rack attached may not open fully, or may need the load removed first. Test this with a bicycle or a dummy load if you can. Also check whether the rear lamps and the license plate stay visible with a bicycle mounted, since a blocked plate is a separate problem that the rack instructions and the vehicle manual both describe.
Compare Candidates on the Same Sheet
Use one written sheet for every candidate: the load you carry, the rail type, the rated roof load, the loaded height, the opening clearance, and the rear clearance. Open the model-year record for each model line you are considering and read the entries for the year in question, then fill in the sheet. Bring the sheet to the seller or the rack dealer, and ask them to confirm each line in writing.