Thanks everyone, I did buy a 2012 Ram dually 4x4 this week to avoid the DEF situation. I think I have decided to get the Companion 18K set up but not clear on which kingpin box to replace if I decide on the air idea. My 2003 M.Suite is supposed to weigh 15K dry I think and we will travel with about 50 gal water, and recently reduced furniture by 300 pounds. We have the 15th M.Suite they built after breaking from Sunnybrook.
All of your thoughts are tremendous and I am glad to be on this forum, very informative.