Having three 110-400W receptacles on my 2019 Limited with RAMbox. I use them all the time. On the console, I have a Surface laptop tucked in the side console pocket, with the charger always keeping it fully charged. In the back seat, I charge my DeWalt batteries. In the Rambox, I charge a DeWalt air-compressor/jump-box unit. Also in the Rambox, I have a 12V battery I keep charged for my ham-radio gear.
If you have the 400W outlet in the Rambox, remember there is a button on the lower left of the steering column. You have to remember to push every time I start the truck.