Do golf cart chargers always charge to equalize voltage?

Did you measure the voltage at the battery posts? There will be some, perhaps small voltage loss for all of the cables.

I would use the Trojan bulk spec of 9.88V. My understanding is that equalize is only needed when required due to lower than expected voltage. Are you suggesting once a month because it's used every day?

I believe Trojan has information on charging and equalization.