I'd still consider a heavy steel bumper. I drive to San Antonio from San Marcos every day and seen what even an empty cardboard box can do to modern vehicles at highway speeds. Too much plastic and thin sheet metal. I also slid into the back end of a truck parked in the fast lane on 35 one time and it put some of the damage on him and let me drive home from what would otherwise have been a totaled jeep. I don't think he minded the damage because his tires were spinning when I mentioned insurance and police report.
Also, some rarely mentioned armor is to put some galvanized 1/4 inch hardware mesh in every opening up front to protect your radiator from rocks and debris.
For air, my little 12v harbor freight air pump works well enough to get me back on the road. No frills, but after converting it to use standard fittings it has been plenty for tending to tires. You could go that route to see if you need something fancier.
Recovery gear will vary but a small shovel and a tow strap has always been the items most useful for me no matter what I drive. Wal-Mart has a strap I like that rolls itself up and keeps the strap tensioned and out of mud, sand, etc. Again, nothing fancy but it has been handy.