I've been contemplating something removable for when I need the space in the bed.
I'm thinking of a stinger (hitch) mounted piece that either folds to the side using a trailer tongue jack swivel, or one that tilts back (away from tailgate) and slides under the truck a bit, so that access to the tailgate is unencumbered.
Problem with the large tires is that even dropped all the way to the ground, the tailgate still won't clear them, and that's just with 33's.
I really like the hitch mount style that pivots out to the side, but I believe those are around $500.
Don't have a 100% solution yet, I just know I don't want to have to step over the tire to access the tailgate, I don't want it blocking the rear window, and I don't want to change departure angle.