Place two jack stands below the axle tubes for support. CALTRACS INSTALL GUIDE - STANDARD.Park truck on a flat work area, chocking the front tires is advised to avoid rolling. With Caltracs installed, reinstall the rear tires and lower the car to the ground. Popular Public Service Links: Fingerprints, Concealed Weapons, SGPI Licensing, Sex Offender, Careers at DPS, The Digest Blog, Veterans, Current News