I had a love/hate relationship with my 2510 in my 2011 17. Replaced the heater, cooling unit, and three thermostats. Still, it does have the advantage that other than firing the spark lighter to start it on gas, it uses no 12V electricity, great for boondocking. Also, a pretty good size for a 17' trailer.
If the door gasket is in good shape, (a $250.00 replacement) you might look into a replacement cooling unit, either dealer or Amish.
As to a complete replacement, I suspect you are going to have to go to a smaller refrigerator. The door size, combined with the height over the wheel limits the models that will fit.