if you drive across nevada in 112 temperature while pulling a patriot tent trailer, by the time you get to st. george utah, the heat will have caused the rear locker to set a permanent error saying "service lockers". you will be unable to use the lockers in utah, or repair the problem, short of replacing the axles, which are not available.
there is a hack workaround for $175 per axle from Z Automototive.
that, and the fuel pump died 20 miles after leaving I-15. jeep would, imho, be a lot better if FCA didn't build or support it.