I contracted to purchase two identical Hino trucks...

I contracted to purchase two identical Hino trucks (when Cambridge Mack still owned Performance Hino). One was for immediate delivery, one 3 months later. The spec sheet I signed off on had a built-in GPS as part of the package. The first unit had the GPS, the second unit did not. I called the salesman at Cambridge Mack ten times over several months, and although I was promised a cash refund or a GPS installation, neither happened. I called the sales manager and did not receive a call back. If you must deal with Cambridge Mack, get everything in writing and verify everything before you drive away.