Getting to that magic 14.8 v with an RV Charge Controller

If Voltage needed to be higher than 14,4, PD would have made it that way.
Are you all smarter than the PD engineers,....or just think you are.
And if you want higher voltage, both my little schumachers go to 15.4 for several hrs before float.
My bigger Schumacher goes to 16+ volts before dropping stage.
My tender only goes to 14.4.
Both my stanleys only go to 13.8, then drop to 12.9.
They all have different ideas, w/ PD being the very best, not IMO, FACT !!