I also have a 185RB, the best mod I ever did was to put a 12v fan like the Vaterra vent fan behind the refer. I could not get the temps in the refer section to go below 60 degrees when the temp outside was over 75 degrees. http://www.valterra.com/rv/rv-main.htm
. I also got the fan for the inside and now the refer works great.
Good luck with your 185RB we love ours.