With 180,000 miles and if the springs / shocks etc have never been replaced I'd start there. Measure middle of the wheel to bottom of the flare and I'll bet its sagged an inch or more.
But also check ball joints even if the upper control arms had been replaced at one time they could be worn out
Depending on when it was built it should be about 19 to 19.75 inches as mentioned above.
But I'd either check everything or have some one knowledgeable to check everything out for you
04 Liberty, Kilimanjaro Edition, Rock Lizard RockRails/Roof Rack/Front-Rear bumper,32 inch Goodyear Duratracs,Moabs,4.10s/ 4.25 inch JBA Coilover lift /other goodies