We have this and tow very well. We got heavy duty shock absorbers and they were not gas. We did not get springs. they were checked and they were not sagging so they were left alone. our falcon takes us everywhere - no problem. hope this helps
We have an AU III sedan that we added LPG to. We ended up having HD springs in the rear to compensate for the tank and the tow. With Hayman Reece towing kit it drives very level.