I've never thought of using one. In fact when I bought my FJ new in 2012 I was also looking at the Nissan Xterra and the main reason I went with the FJ was because the Xterra door armrest had a big cutout right where my elbow sat that was very uncomfortable. The FJ armrest was comfortable enough.
I'm Dave and my FJ is the Mule. She's an army green 2012.
3" Toytec Boss 2.0 lift, Toytec Superflex HD coils, RCI skids, Resz Fab Stinger front bumper V2, 33" KO2's, Rokmen UCA's, All Pro Heavy Duty sliders, Rigid lights.
I have a YouTube Channel for my offroad adventures here: Chicken River...