What about one of the huge Genie lifts? I've used them at my old job and you can stuff them places a class 8 with crane will never get to. The other thing is you won't have a class 8 with crane sitting if it gets slow.(and Genie lifts will sell in a heartbeat) Class 8 trucks are also expensive to maintain. Think gallons of oil when it gets changed. Hi-floats on the front are $900+ a pop. Then you got the drive tires. Cheap is in the range of $450 each.
Truck chassis has to be inspected once a year and are done at the dealer. IIRC crane inspections are the same cycle, but by a certified specialist, second stop and more money. Although the crane inspector is usually a rigging inspector too. Oh yeah more money since its another specialty.
Here is the biggie. You NEVER under any circumstances do any of your own maintenance on anything EVER! If there is ever a crash involving your rig and you touched anything on it...well, nice knowin' ya. Every maintenance record must be kept with the truck and be traceable back to the facility. At times motor carrier enforcement will ask to have certain records faxed to a weigh station. Truck will sit until they show up. Guaranteed.
Class 7 and 8's are a different beast. If there is a light it better work. If there is a switch it better be hooked to something.
I have to go through inspection with my F350 because of my racing. They will fail you for a nick in a wiper blade. They check the fan blade too. If they feel there is an excessive leak or oil on the motor it sits until repairs can be made.
I am well versed in this because of my own experiences and because my nephew used to pull wrenches on big rigs. He is now a fleet manager. I also know the Trooper in charge of motor carrier enforcement.
Why would he buy a 60' genie lift? How would he transport that? My buddy in the business has a 45' and has to transport it on his backhoe trailer.