$57 worth of Monroe Air-Max air shocks in the rear, plumbed to a schrader valve just behind the rear bumper, gave it a 1-2" bump in the rear and eliminated the bottoming out. The old shocks had HOLES RUSTED THROUGH the metal boots...They had absolutely no charge left in them. Time for front shocks as well!
I'm impressed by the air shocks. Totally plain brown box and simple instructions, but all pieces and the shocks themselves were Made in USA. The shocks definitely felt heavy-duty, and the air lines, o-rings and valves were quality pieces. Test drive was very rewarding: I was impressed by how well the rear rode with only a bit of clearance to the bumpstops. Air shocks raised the rear bumper a touch, but the rear was far more solid than before.
Still a bit of driveline vibration to deal with to make the lowering job a success in my mind...