I just completed installing a RoadMaster baseplate on my 2014 Ford Taurus SEL. I purchased the baseplate and Universal Diode Wiring kit from eTrailer.com ($437 total, with free shipping).
It took me about 5 hours to install the baseplate. I had some trouble getting the cowling back on (due to some interference caused by the cut-outs not being large enough), but once I enlarged them a little more, it went right back on properly.
The electrical kit took about another hour or so to install.
Local Campers World quoted $1127 and a local RV dealer quoted $750 plus 6-8 hours of labor at $100 per hour.
The instructions that came with the baseplate and wiring kit were very clear and walked me thru every step of the installation.
Hope this helps?