A: Model #308-5 is moisture resistant, not waterproof.
A: Model # 338-5, the top is 200 lbs. duty rating..
A: The model # 338-5 is moisture resistant. We do not offer any product that is waterproof.
A: There is no supporting information that Model # 338-5, will fit into a Jeep XJ. Please go to the following website, to see how the 338-5 is installed in a regular truck bed. On the left hand side, under RESOURCES, click on the installation instructions. https://www.weatherguard.com/products/truck-tool-boxes-equipment/pull-out-storage/HeavyDuty/338-3