technician job experiences

This is a generic question in nature -I've been a tech at a mom and pop shop for a long time (I am a non-family employee with the most seniority)and am thinking of going to a tire chain or dealership job-vastly different enviroments -so have any of you done a similar thing. I've thought this thing from so many angles that I'd like to get other peoples thoughts......
Check with your local VMF that services the postal service. Great pay, good retirement and they provide all tools. Go to the USPS website and click on careers at the bottom of the page. If considered you will be required to take a computerized test and also a shop test. Shop test usually consist of brakes, timing of distributor and some troubleshooting. Pm me for more info.