I can't answer from experience, so I waited to see if somebody else could. With no replies yet, let me say
1. You can go to at least the BlueOx and RoadMaster websites and download the install instructions, with pictures, for the exact baseplate you need. It will also include notes as to trimming the fascia and other little quirks.
2. Also, at least for RoadMaster, the "lookup" where you match a baseplate to your vehicle model, has a Difficulty Index, and also some installation notes.
I don't know how much is available on the web about the Demco. I'm sure there IS an instruction sheet, but you might have to call them and have it emailed or faxed to you.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB