The previous owner of my 1968 Roamer Riviera 37' AL installed a cheap dorm refrigerator 110v. I would like to find a decent unit for my needs. I have NO experience with 110/12volt units and I really don't think I need one. I am usually out for 24 hours max. Most unts will hold cold for that period with an occasional generator use. I would like some thoughts as to a quality unit, reasonably priced. Should I consider a dual power unit or will I be looking a battery replacement? The space is 24 3/4" Wide, 35"High, 24 1/2 Deep. The challenge is the hatch opening. It measures 22 1/2" wide. I'm really not sure how to determine if a unit that fits the space will fit the hatch. Thanks.