You are right, the Hensley hitch bar will not fit (confirmed by Hensley).
And yes, the breakaway cable is attached directy to frame, not to the receiver or related parts. That one was obvious!
And finally, the 700lbs on the tongue is within my payload as all cargo travels in the trailer. Only have wife and kids in the car (total of 550lbs including myself). The ride comfort has not been an issue this far. No excess bounce and never bottomed out.
Bob the frog from Montreal
2009 Flagstaff 227 pup (Sold in 2014)
2015 Wildwood 261BHXL
2010 Mercedes-Benz ML350 Bluetec
ProPride 3P Hitch