This question lacks good judgment on physics for a reliable power boost.
How did you get the notion this would work?
In theory, this concept works for Car 1kW audio systems for a few milliseconds before the peaks of 20 Hz woofer cycles to prevent voltage drop from 12V by shunting a lower ESR resistance in parallel with the battery 6S x 2V which is also charged by the alternator to 14.2V
A large Supercap is 10F @ 3V. Then they must string identical Caps in series and parallel to create larger ones, just like cars string 6x 2V cells in series (6S).
Then if you string 20 caps in series each being 10F in hopes of achieving a 60V string the result is only 10F / 20S = 0.5F = 500 mF. This is negligible compared with the capacity of your 60V bank. Each 18650 cell of Li Ion is approx 10,000 Farads @ 3.6V thus 60V bank ought to be 60/3.6= 16S or 17S (S for Series, P for parallel). Thus the equivalent Capacitance reduces by N cells or 10k/16= 8xx Farads or at least a thousand times more than 20 of the largest Supercaps..
Any thoughts of this working, need to understand these assumptions (which I can prove) and retune your expectations with better specs.
You will get a longer life on your eTrike by never letting it deplete more than 50% in a days use. Then using only half the capacity you may get up to 10x more charge life cycles than if you depleted all the charge every time. Go educate yourself at the Battery University website. It has lots of useful info on how to retain the energy and reliability it has now rather than trying to destroy it. Heat is the ultimate problem with energy use as every 10-degree C rise in the motor windings or battery internal junction will degrade its lifespan by at least 50% according to Arrhenius Law of Chemistry. At some threshold, it will fail catastrophically with some thermal runaway.