For a fridge yes a 50 amp anderson is the go, or a twist lock Engel/Baintech style mountable plug socket combo
Cig sockets should be avoided at all cost for running anything whilst on the move, or stationary for that matter
Try and source merit or the twist lock engel style, Merit have proved themselves to be up to the job for a positive connection.
Plus run all these ovens etc from your Aux battery as well, thats why you installed it in the first place, to run add ons
I have but dont use cig plugs for anything anymore, but when away sometimes you share gear so you need a compatable
outlet. but not a fan of cig outlets