Not all hitches have the same ground clearance. One of the reasons I bought the Class III Curt hitch was that its "cross tube" and receiver seemed to ride higher than the cross tubes and cross bars on other hitches I considered. I recommend considering the Torklift hidden hitch since its brackets and cross bar ride above the rear plastic underbody cover instead of below it like my Curt and most other hitches.Thanks for reply. I will take a look into to torklift.
Another question, would the hitch under Sienna too low which likely hit the ground when going over bump? It seemed to me back clearance on sienna kind of low (as I compared to my old odysse)