Well, it is a bit late to say it; but, no. A Mt. bike is probably not the best bike for a work bike. As others have said, any suspension is unnecessary. Further, it lacks real cargo capacity. My roommate, while I was in grad school, was also an independent PC tech. It was not all to uncommon for him to bring a PC home so he could do a job at his convenience.

I worked as a copier tech for about ten years. I would frequently park my van wherever I could and biked the rest of the way to the client. I also used a Mt. Bike and it was not ideal. I eventually modified a little cart to use as a trailer so I could pack all the stuff I needed with me on service calls. It was never ideal.

There are a number of bikes entering the market that are best described as "cargo bikes;" manufacturers that come to mind are surly, Kona, and I think trek has one. The same effect can be attained by adding an "extra-cycle" kit to what you have; but, it still will not be a single unit designed to work together. I would suggest going and looking at these cargo bikes; they may not look as cool; but, they are a closer to meeting the needs of a tradesman.