The ease with which one can stick magnets to a shock absorber and surround that field with copper wire windings makes Regenerative Suspensions/shocks enticing.
Rectify each coil's output and feed that to a MPPT and you're golden.
Well...
While accelerating: Only if your system has a higher power to weight ratio than the std car, truck etc, improving the performance of the vehicle as a whole.
Once cruise speed is reached; power to weight ratio becomes a non-issue and the added weight increases the power generated by a slight amount.
Due to time constraints.
here, in no particular order, is the (full paper) research i have found so far on the subject
In a nutshell: The heavier the vehicle and the worse the road; the better.
(off road)
https://www.researchgate.net/publica...y_Technologies
https://www.sunysb.edu/commcms/aertc...Zuo%202011.pdf
https://dspace.mist.ac.bd/xmlui/bits...=1&isAllowed=y
https://www.researchgate.net/publica...tion_rectifier
https://sci-hub.ru/10.1007/s12206-015-0331-7
https://www.diva-portal.org/smash/ge...FULLTEXT01.pdf