You could do many things and they will pay off, but it depends how long you're going to keep your vehicle, some may pay off after a few months, some may take a year and half.
Unless you're looking to cruise at 75mph and better that brick styling has no effect, aero issues don't come into play until beyond those speeds, as wittnessed with the TG tests on myhtbusters, no diff at 55 mph, except when they lost the weight of the tailgate on the truck.
1995 Jeep gc ltd, 2005 Jeep gc ltd , 71 Dart, 73 RR 440-6pk, 78 Mag GT, 85 Power Ram W-350, 92 Daytona, 99 Dakota, 08 Ram 2500
Less than 8 is like playing with half a deck
Long Island Motorsports Association