I have a 2014 lacrosse 327RES, and I'm at a loss trying to figure out the same problem. I have a horrendous heat load in my kitchen area also, but my water heater is in the rear of the camper which is almost 15 feet away. It also seems to be very humid in that area and when you look at others in the campground, I have Niagra Falls coming off of my roof compared to a trickles from everyone else.
Retired Army CW4 - "Waterborne"
2005 Chevy 2500 crew cab with Duramax/Allison
2014 Lacrosse 327RES
Days camped 2014 - 0, 2015 - 24