We are thinking about replacing or 1983 12.5k Kohler diesel in our 1984 Newell 40’.  We are also upgrading all the HVAC so our plan is to go smaller in the 6-8k range, we figure Based on new loads we only need 5k but want a buffer for whenever we might need.  Our biggest complaint about the Kohler is that it is extremely loud, so since it stopped making power rather then repair it is time to upgrade. 

What are your thoughts on going smaller or what replacement models fit the space in front an