Anyone remember the "Dual Power Adapter"? need instructions

About 10 years ago, I installed a device on my 30 amp motorhome that allows me to connect 2 shore cords (the standard 30 amp cord) and a 2nd 20 amp cord to the pedestal where I easily run both a/c's with power to spare. I bought it from a company (no longer around) Power Solutions, and it has some instructions on how to connect it up. I am looking for those instructions for a friend that wants to make one of these for his 30 amp motorhome. I did find some instructions on the web, but it shows the wiring being connected to the camper breaker box, and I know that was not how this particular device was connected. Mine is connected in the shore cord area in the transfer switch. This is not to be confused with the 'cheater cord'. This was a simple junction box switch that broke out the circuit where the 20 amp circuit on the generator powers the first a/c and allow you to plug that into the pedestal when on shore power. I think the man who sold it to me is Bill Nemecek or something like that? Anyone remember or have a copy of those instructions? He made some specific to Winnebago/Itasca. It works PERFECT and is the best modification we have ever had. I suppose I could take mine apart and figure out how it was installed. But sure would like to find some directions from the original purchased device.