well I agree with CMAYS ,looks wont tell how good u can weld, I'v seen welders that just got out of a welding school, some very young ones with very little sperience, some of them still single with no kids to feed and perhaps some still living with mom and dad, so they are able to save some money with a couple of turnarounds and buy a nice rig ,but alot of them ... just cant weld. As for the other part I can say that driving a dually or single it all depends on the kind of project you are working on, I have worked on the pipe line environment , drilling rigs and petrochemical plants, refineryes etc. Pipe line and rigs seem to be kind of more informal than petrochemical specialy pertaining to safety, and driving a rig inside on of this plants ,has alot to do with safety, they dont want to face the situation of a having one of this trucks with a one abused rear flat tire blocking the traffic for emergency vehicles.