Might be a tight squeeze based on tire size, what's the offset? I believe our rear wheel tub is bigger than the Challengers.
I just recently had some new wheels put on too (secret for now) and here's my setup, no rubbing even though the retailer who sold it to me said it would:
20 x 10 up front, +20mm offset, 275 stock Pirelli All Seasons
20 x 11 rear, +20mm offset, 305/35/20 Nitto 555r