i think this has been discussed before on this forum.  After a day of fishing what is the best way to charge the deep cycle trolling motor battery.  After getting home I put the battery back on the charger and bring it back to 100% before storing.    I started to read about equalizing and not sure I understood what this process is all about.  I have one battery that is 6 years old and the other is 1 year old.  Next question do they make a battery cart to transport from my truck to boat dock?

I can't answer the battery charging question, although from my understanding modern chargers do a lot to the battery.

What I can offer is what I use to transport batteries from car to dock. This works at Six-O for me, two trips this week.

https://www.amazon.com/gp/product/B074C1HB4D/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I load it with two batteries, my trolling motor, tackle bags, anchor, and anything else that will fit. It manages the gap in the dock at Six-O pretty well.

Also see my post about trolling motor mounts, that rubber piece works great at Six-O, turn on a dime(relatively) on the pontoon without the motor jumping off.

FYI, Academy Sports has a similar cart on sale now for $45!