Dometic makes great basement model freezers for RV's made of high-impact polypropylene. They offer sizes ranging from .7 CF (23 12oz cans) up to 3.77 CF 113 quarts or (144 12oz cans). Maybe figure out what size you are thinking? I have had owned the Dometic and Norcold's. Both companies offer freezer with both DC and AC power.
I had the CF-80 which is currently second to the largest offering 2.8 CF 85 quarts (103 12oz cans). This was a great unit in my humble opinion.
This is Dometic's Largest to date RV Freezer at 3.77 cubic feet or holds 144 12oz can equivalent
[h=4]CF110 Model[/h] Dimensions (HxWxD).: 22 x 19.6 x 31 in.
This is the second to the smallest Dometic RV Freezer at 1.1 cubic feet or holds 41 12oz cans equivalent
[h=4]CF35 Model[/h] Dimensions (HxWxD).: 15.1 x 14 x 22.8 in.
The Dometic 1.3 cubic feet recreational vehicle camping freezer holds 48 12oz cans equivalent
[h=4]CF40 Model[/h] Dimensions (HxWxD).: 17.5 x 14 x 22.8 in.
This Dometic model is 1.7 cubic feet (52 quarts) or holds 68 12oz cans equivalent
[h=4]CF50 Model[/h] Dimensions (HxWxD).: 19.4 x 14 x 24.8 in.
This CF-80 model Dometic 2.8 cubic feet is a great overall size for the serious RVer and holds 103 12oz cans equivalent
[h=4]CF80 Model[/h] Dimensions (HxWxD).: 18.1 x 19.6 x 31 in.
This is their little .37 cubic feet (10.5 liters) baby model freezer, probably more suited for a car, truck or van.
[h=4]CoolFreeze CDF-11 Model[/h] Dimensions (HxWxD).: 14.09 x 21.26 x 9.25 in.