I have a Gobi ladder, probably the most popular ladders for 5th gen 4runners. To be honest I just use my rock sliders or stand on rear tire to access things on roof rack, the Gobi ladder is used to look cool and have my Rotopax fuel can mounted onto when weekenderlanding. There are also a few other ladders out there. Baja, Victory 4x4, C4, etc
4Runner Hatch Ladder | 5th Gen 2010+ - Victory 4x4
C4 Fabrication Summit Hatch Ladder Bolt-On Install For 5th Gen 4Runner