Thule/cargo box for Victory 4x4 full length roof rack

Searched all over the forums but still haven’t found something definite. I have a Victory 4x4 full length roof rack and looking for a low profile Thule cargo box, or any low profile cargo box really. I currently have a Plano rifle box bolted down for tools, but with the family growing and dogs, we just need some more space. Does anyone know of any cargo boxes out there that would fit on the current cross bars without moving them or taking any out? Or is there an adapter we can buy to support a cargo box? We still need all the cross bars for all our gears.

 

I just bought one of the large cargo bags, and although it was somewhat of a pita to get strapped up there, it held up very well under downpour conditions. I put a suitcase in there as well as other items. I have a full size Sherpa Crestone. This is the one I bought but there are many in different sizes.

$100 FIVKLEMNZ Car Rooftop Cargo Carrier Roof Bag Waterproof for All Top of Vehicle with/without Rack includes Topper Anti-Slip Mat + Reinforced Straps + 6 Door Hooks + Luggage Lock

Amazon.com: FIVKLEMNZ 15 Cubic Car Roof Bag Cargo Carrier, Waterproof Rooftop Cargo Carrier with Anti-Slip Mat + 8 Reinforced Straps + 4 Door Hooks, Suitable for All Vehicle with/Without Rack (15 Cubic) : Automotive

Good luck.