Ultracaps are expensive, a less expensive option would be to use LiFePO4 batteries.
A 53ah pack like I use will have no problem taking a charge at a rate of well over 150 amps.
Also if you don't like the idea of an engine driven alternator there is an alternator relocation you can do that moves the alternator to the drive shaft. Hot rod guys do it to just to clean up their rods engine bay or if they don't have room for an alt under the hood. With something like this you could charge the batteries as needed like during EOC, but it only will work on RWD and 4wd vehicles.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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