check the rear of the sills are ok, they collect water from the front tyre flicking it down the sills, the rear of the sill is lower & reservoirs. Its an easy fix..put a hole in there & drain them... if its sluggish the small filter in the pump needs a clean, no one cleans it !! gearbox, is it smooth, auto diff locks , if not used seize.
thats it the rest is the std issue look fors ...there a superb 4x4 !