From allpar.com:
"The Trail Rated Jeep Patriot sat 1 inch higher than non-Trail Rated versions and met Jeep off-road capability requirements for traction, water fording, articulation, maneuverability and ground clearance, including 9 inches of ground clearance, a 29-degree approach angle, a 33-degree departure angle and a 23-degree breakover angle. This version of the Patriot also had additional body sealing and high-mounted drivetrain vents to support 19-inch water fording capability."
I believe the trail rated version includes a higher-amperage alternator, tow hooks, and skid plates as well.