Lots of options for sure! What are kinds of stuff are you planning to put onto the roof?
I had considered a cargo lock box like this..
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But ended up with a low profile more aerodynamic Rola roof basket to add stuff up top when needed.
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Keep in mind loading stuff on roof may require a step stool.
I carry a 2 Step sturdy aluminum in Jeep when camping, and it gets used.
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Both Thule & Rola has some nice waterproof bags, that can go up top at a reasonable price on cross bars.
Many may also opt for large square ones to mount to rear, for easier accessibility, compared to the roof.
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Just some ideas...:gr_grin: