I looked at some options, but won't be replacing mine. Frigidaire has a 15 cu.ft. top freezer model that would fit in the height and width cutout of the Norcold with room to spare, but is 27" deep vs. 24" for the Norcold.
2017 Coachmen Orion, Ford Transit 3.7L: previous
'09 Pleasure Way Lexor, '05 NRV Dolphin 5342