All depends how smart the charger is. Most supplied chargers ram in an initial charge rate and keep on charging, even though the batteries are topped up. This does them no good. What's needed is a smarter charger that will switch to a low rate of maintenance charge at the end of the main charge.
The golf trollies you describe might have a smarter charger, might not. It depends on useage, too. If the vehicle will be used the following day, it's not that much of a problem with a dumb charger. What you should avoid with a dumb charger, is leaving them on it for days on end.
Iiwy, I'd heed the bike supplier's instructions.
