Recommended tire psi is on label / decal - located on the drivers door or the door jam ..
Below is a link to a free owners manual download:
https://cdn.dealereprocess.net/cdn/servicemanuals/dodge/2010-nitro.pdf
RepairPal Certified shops can diagnose and repair your 2010 Dodge Nitro. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.