Hello   My name is Syd Dunn.     I have been doing  Mobile Diesel Emissions tests on Heavy Duty  vehicles for 18 years.  I am a licenced diesel and heavy equipment mechanic with many years experience.    I was also a broker / owner operator and realize the need for the type of service I try to provide.   I come to you A.S.A.P.  to save you time and money.                                                                                                                                                                      Note:   On Medium duty pickups - please check the door serial number plate to ensure that the vehicle is over the 4500 gvwr.    Under 4500 gvwr has to be done by a light duty facility.