I have recently hardwired my Nextbase 512GW
I purchased a Bojo Genius Trim Tool Set before I started which made the whole job so much simpler, be it lifting the panels, popping the clips and feeding the wire under the airbag to name just a few of the benefits.
I used the Nextbase hardwire kit NBDVRHK-RP.
Feed from F40a ATO 20amp cigerette lighter, electrical socket fuse slot, Page 291 Owners Manual.
The How-To links on here were superb, thank you the Forum and its members.