Dial in clean, rattle-free ways to stash fuel, tools, and trail gear on jk models. Verify a 5 on 5 inch spare-tire bolt pattern, and know some mounts require removing the backup camera bracket; subwoofers or tight seat bolts can affect under-seat and cargo installs. For fuel, nato-style 5.3 gallons around 40 lbs is common, while RotopaX-style brackets recommend staying under 50 lbs, and both 2- and 4-door rigs are supported.
Install can be straightforward or take a fair amount of time. Have metric tools ready; a breaker bar helps with tight seat bolts, and a second person can help with J-hooks. For spare-mounts, you may need to remove the camera bracket. Watch small strap holes, loose vibration stops, or light rails/snaps on tailgate bags and address as needed.
Some do, but not all. Certain racks are confirmed for JK 2- and 4-door from 2007-2018, while some bags are not made for the 4-door and may need extra tie-downs to keep the front from flopping. Check your door count and year in the listing before you buy.
Capacity varies. A NATO-style can is 20liters or 5.3 gallons (40lbs depending on can). With RotopaX-style brackets, do not exceed 50lbs on the bracket. If your mount uses straps or vibration stops, make sure they seat well and consider enlarging drain holes only if your use demands frequent draining.
They can, if your setup matches common JK requirements. Check for a Jeep Wrangler 5 on 5 inch bolt pattern. Some mounts need a centered clearance hole and may accept 5 x 4.5", 5 x 5", or 5 x 5.25". On certain mounts you'll need to remove the backup camera bracket. After mounting, verify it doesn't block your rearview, especially with larger tires.