The truck that I run is a Kenworth T300, with a maintainer bed. It has a 500 amp miller welder with the air pack, 10k crane, willburt night scan light tower, 70 gal. waste oil tank, and 3 70 gal fresh oil tanks. Our company runs 5 trucks, 2 335 peterbilts, 2 T300s, and and old school L8000. We travel alot, which is what facilitates the bigger trucks, but you can never carry enough stuff when you are 500 miles from the shop! I only have a pic of the L8000 on this computer, will post my Kenworth when i fire up the other computer.
My ultimate service truck would be a 379x pete, or a T800 on a tandem axle with big HP backed by a 13 speed or bigger tranny and a 36" sleeper, with a 14k crane, 60cfm hyd. compressor, 500amp welder. Compartment space on a service truck is a big priority in my book, thats the logic behind the tandem axle, plus we tow a trailer alot, moving buckets, grapples, whatever we need and it would allow us more gross when loading up.