I have a V6 but also have one of the lightest WK2s built. I do not recall any other car line that the same basic model had a dry weight range of nearly 1,000 lbs. True, a lot of that is drivetrain related.
Personally suggest that for WK2s under 4800ish lbs and rarely used for towing/mountain/high altitude use are candidates for the Pentastar. Over that an optional engine might be a good idea.
Stang, I would be interested in knowing if the ride (once you got both Jeeps aligned) was really much different between the two? If I understand correctly, your Hemi has the tow package (which includes different rear suspension, unless they both have QL).