Welcome to iRV2.
How heavy a load are you planning for the 12v outlet?
Are you thinking of placing it in the outside wall , or would in the base of the seating area be ok?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.