Gooseneck coupler hitting slip tank

Recently put a slip tank in my 3500, and upon hooking up my gooseneck for the first time, I forgot to account for the bolts in the coupler, and there isn't enough clearance. Upon turning left with the trailer/truck at a difference in height the one bolt just catches the tank. Only took off some paint, but need to change something because i'm not ok with that.

As you can see in the picture there is some room there, but not much. Is there some easy way to put in shorter bolts? If I could get...

Gooseneck coupler hitting slip tank

Gooseneck coupler hitting slip tank