It took some work. A friend helped me remove about 1/8-1/4” from the inside of the hitch receiver with an able grinder.How did you manage to fit the 34.6" spare tire underneath? I'm on a similar boat to see if I can do fit a 285/65/R20 (34.6x11.2) spare.
I also have the 6’4” bed, which based on some other reports here, may have slightly more room between the heat shield and the hitch receiver, though I haven’t confirmed that.
