A motor has a high inrush current. A motor may pull less than the 400w limit while running, but pull 600 or more watts. An inverter can go into protected mode.
I’m contemplating flipping mine. My job changed, no longer need the fuel efficiency, but would like true 4wd. By the time I get it in January, the only way you will be able to get one is if a buyer backs out. The dealer won’t sell it at msrp.
It would be costly, and there is most likely no wiring in the truck for it. It would be far cheaper to upgrade to lux package, unless it is an xl, where in that case your new seat will not match.