Quick answer - - YES. I have the MorRyde pin box and my stabilizer is useless with it. If you must stabilize more than existing rear ones, there are several good brands of stabilizers that permanently mount to the frame and the existing front jacks and rear stabilizers that do a really good job. Easy set up and retract, nothing to haul and store.
2003 Dodge HO 6 speed Laramie Dually, Jordan controller, RDS fuel tank, Air Ride 25K hitch
Carriage 36' fiver, Onan 6500, Prosine 2K inverter, 3 slides, MORyde IS and Kingpin