Battery charger - equalization

Up to you but you really don’t need both, the power supply can trickle charge just fine, just set it’s voltage at Trojan’s float voltage spec, 2.25 V/cell I think. Set the current limit on the power supply at 2A, voila, you have a regulated trickle charger that will maintain 13.5V and not exceed 2A. You are right that you don’t need to leave it on all the time but it won’t hurt anything if you did. Just keep an eye on the water level.

I think probably most anything reasonably priced you get these days will be switch mode, transistors being cheap and iron and copper being expensive and heavy.. Unless you have sensitive electronic gear next to the PS in your basement that should work fine for you.

Exactly. Sensitive electronics. Of course, there is a switching PS in pretty much every piece of electronics in your house anyway, including all the compact battery chargers. Check the EMI specs on the PS if you’re concerned about it.

As long as they clip on the battery posts they will be fine. If not you can just make something up you like better. Charging them separately or together in series is fine, either way, just not in parallel as you can’t guarantee the same charging current to both when they’re in parallel. Each battery has 3 series cells so set your voltages accordingly. Cruiser forum is a good site, unlike rver’s, cruising sailors have to keep their systems operating all the time, its not like they can run down to the Wally World and get a new battery if they have a problem. Have fun.