I don't know what model you have either. I was thinking about the Realpower set up too. When I checked it out they were installing a set on a truck just like mine. The cost was 5000+. And they would not sell it as a kit, you had to have one of their installers do the job. There is one here in SoCal. The price seems awful high.
You can buy a PTO for under 200 and a 10kw belt drive generator for around 620. Depending uppon your use of the generator you could probably install an hydraulic pump on the engine and use it to drive a generator.