Where are you driving that you hit something at 5"?
Pulling out of my driveway I would just scrape one of the L brackets on the Fastway e2 round bar hitch. Also banged it enough to pull the clip out of the pin holding the spring bar to the L bracket leaving WalMart after buying groceries. Dragged the L bracket through the dirt on a pot hole in the driveway of a campground. When level the top of the coupler is at 15.5 inches. Pretty low trailer.
I replaced the hitch and left the axle flip for a future possibility. I chose the Reese SC trunnion bar with integrated sway control. Reese part #66151, lots of ground clearance now.