What I really want is some kind of truck which can provide on board power to tools, as well as motive power. This could be something with a big battery bank, or a diesel-electric hybrid (where the diesel can be left running for days at a time and refueled under load...), etc.

It might be hard to convince someone who is a "traditional truck buyer" to accept a slight range penalty or whatever (although fleet managers and business owners would), but if he could plug in his tools and have great work lighting/etc. at the job site, he would probably take it on that basis.