My current set up with the Pace Arrow uses an 8" drop hitch to get the Master Tow dolly gooseneck to sit level. With such a long overhang at the rear of the coach, and the bottom of the hitch being 17' off the ground, I've heard it scrape a few times on really steep inclines, but it is extremely rare.
With our previous coach, a Jayco Seneca 33ss (class "C") and the same 8" drop hitch, and with not so much overhang, we scraped the hitch all the time.
That's why we dumped the EZtow dolly. That and the fact that on tight turns, like in and out of gas stations, it left black skid marks all over the place.
They just don't track well enough for me.
Mike in Colorado
2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM and rear track bar, PPE deep Tx pan, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly.