18" all around would not be a problem... 225 or 235 40 up front perhaps, along with what you mentioned for the rear

Not a Mopar, but here are 18" I put on a Camaro to give you a general idea of height.. 245/45-18 up front and 285/40-18 out back..




And 245/40-17 all around on my old Valiant Ute (A body basically)