Fitting an air compressor?
Be aware that if you're running air lockers, you'll need to
fabricate a pressure vessel with a pressure switch to ensure you
have a generous volume of air at 120psi to engage the lockers.
Any air leaks become noticeable because the compressor is
usually left on all the time (controlled by the pressure switch of
course ;-) Many air compressors are not designed to have air
pressure back on them when not running, so the equation becomes
more complicated by the need for a one way valve between the
compressor and the pressure vessel.
Actually, a small bbq lp gas cylinder makes a good pressure
vessel. Also, in Aus, it's now quite legal to install fittings
into your bull bar and use the tubing as a pressure vessel.
However, hate to be around one when you hit something...