I bought a Titan rod vault (the predecessor to the Denver rod vault) probably 6 or 8 years ago for use in Montana. Originally, I mounted it on a roof rack that I put on a Jeep Wrangler Rubicon Unlimited that I had at the time, but I later put in on a rack that I built for the bed of my Polaris Ranger side x side.
These rod vaults are much more prevalent in use in the west than in the east, and although I never kept rods in them except when I was going to and from fishing, I never felt that they attracted thieves any more than my unattended vehicle attracted thieves regardless of where it was parked (except in my garage). My rod vault locked onto my roof rack, and my rods and reels were also separately locked inside the rod vault. However, the rod vault’s keys were generic, and I discovered that I had the same keys for locking my RV, and for something else too that I had.
If I was going to buy another rod carrier for the top of my vehicle, I can’t think of a better rod carrier than these rod vaults. If there was/is one, I’d probably have bought one.
John