TyroneAndGladys wrote:
On our RV we have two house batteries with one being under the hood and the second one in a battery compartment at the rear of the RV.
Are you sure those are both "house" batteries? Typically battery under the hood is for the engine and the battery in the back is for the "house." Sometimes they are both under the hood.
It is not good to install different types of batteries in parallel as the better one will be weakened by the weaker one and one is always getting overcharged and the other is getting undercharged.
Articles about RV electrical systems:
BATTERIES--AND OTHER ELECTRIC STUFFThe 12v Side of LifeIntro to Dry CampingBattery Education