Depends on the cure and the paint used. It will indeed chip, moreso if the paint was overcured by the OEM. Keep it clean, sealed and touch up any chips as soon as you notice them and it will last a long time. I've seen outdoor furniture go 25+years without chipping. Depending on the type of powder (nylon is the most chip resistant) there are varing degrees of chip resistance. If the pull bar is from a quality manufacturer, then the coating should stand up well.
In a past life, I worked for a large, non-captive, custom coater. When we did front bumpers, we laid down a coat of powder anti-chip primer over e-coat and the an acrylic powder top coat. Tested adhesion using a shot blast and we never had a fail to substrate. Very expensive process but lasts a long time.