I've been disappointed by the switches. They're not as flexible as I'd have expected: they only operate as "closure to ground", and they only work when the vehicle is on. So you can't use them to control anything powered just from the house battery, or anything that you might use while camping, or anything where one side of the switched circuit isn't ground. Yes, relays can take care of some problems, but not all. (I have a 2016 -- I think they made some changes to the switches in 2017, but I don't think they changed these aspects.)
In addition, they're positioned right where someone's knee will usually disturb them while moving from driver or passenger seat to the rear of the van -- so I'd be unwilling to have them control something where inadvertent turn-on or turn-off would be an issue.
In the end, I unplugged them, and turned their space, plus the coin-holder, into a new storage cubby. Maybe someday I'll think of a use for one of those switches, but I'm doubtful.
Silver 2016 high roof cargo van, 3.5l Ego-boost, 3.31LSD. HD alt, dual batteries, power seats, and the coveted chrome grill.