The best replacement for air shocks is gas shocks.

The best alternatives to air shocks are rated as following:
★★★★★  gas shocks
★★★★★  coilovers
★★★★  air bags
★★  airbags
★★  spring shocks
★  coil shocks
★  coil springs
★  coilover
  coilover shocks
  shocks
  air bag
  coil over
  coil over shocks

Your alternative for air shocks is not listed? Suggest!
Speaking about air shocks, one probably shouldn't forget about traction bars.

Other search terms related to air shocks and their ratings are:
★★★★★ traction bars
You have in mind a companion for air shocks and it is not yet here? Propose!



Google Trends

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air shocks
gas shocks
coilovers