We have a 179 and really like it! I currently tow with a diesel 2500 pick-up but I don't use a WDH with the R-pod.but do have sway control.
But we are enticed by the 195 because of the bed orientation and certain other features. I notice that the 195 is going to be a foot longer which isn't a major deal. The tongue weight is also supposed to be 300 lbs more according to the specifications that I saw. I know that the tongue weight will probably be higher when the trailer is loaded but can be effected by water tanks, etc.
At what point does a weight distributing hitch become really important? I suppose I could ask a dealer but I put more credence in the response from this forum.