If you are providing the charger, why are you using the plug-in models? The only time I install those is when the customer already bought it that way. Most customers buy the hardwired model and when they ask me beforehand that is what I recommend as well.
Good points. I guess this is where it's all going, isn't it. The only reasons I can see for a non-hardwired approach are (1) the RV scenario and (2) the possibility of an upcoming (1-2 yrs) house sale, and the desire to take the charger along.
There was one other. Manufacturers for years have floated at times the notion of charger portability -- as in, "you can take it with you on vacation, to your second home." As far as I can see, if you can afford a second home, you can afford a second charger.