I have been accused of being a "disgruntled PD employee" and similar. I am not. I have discussed what things a charger should do in previous threads and don't want to start all that up all over again. I have no ax to grind, and no company to promote. Third party Smart chargers are common. The following site is one that sells them, but so does Amazon and others.
12 Volt Smart Battery Chargers | 12v Powersports Chargers
You should look for:
1) Multiple phases of charging
2) 14.8 V charge voltage for the bulk charge
3) if you are dealing with an AGM or gell battery make sure the charger allows you to specify the battery type
4) Remote voltage sense
5) Remote temperature sense
6) charge phase switching based on voltage and current curves, NOT a simple "timed" charger.
I will not recommend any specific charger. I will recommend checking the list above against any charger being considered and trying to get as many of those properties as you can in a budget you are willing to pay.
Trickle chargers are not sufficient for your main charger. The battery needs to be charged fairly quickly, and the charger should handle the bulk of your DC needs when plugged in as well as provide additional capacity for charging the battery. IOW if you are plugged in somewhere, and your battery has been discharged by dry camping
, you do not want the charger struggling to just keep up with your usage at the RV park, you want to have enough to handle those needs as well as some left over to recharge the battery.
If they cannot be programmed to charge an AGM (sealed) battery and that's what you own, then they will cook your battery because they are trying to charge a "wet cell" which can be charged faster. The charger really does need to sense the voltage AND the current that is applied AT THE BATTERY in order to correctly (SMART) charge the battery. If it isn't doing that then it isn't smart charging, it is just hoping for the best.
We have seen the results of that strategy.