The pair of group 27 deep cycles are fine for the house batteries. I had to replace my 7 year old house batteries this week. Personally, I went with a pair of Interstate Golf Cart 6v batteries wired in series. However, that was just a personal choice, and a pair of 12v deep cycle batteries wired in parallel is fine.
Do not go with a deep cycle for the chassis battery. Stay with a starting battery.
Put a
Trik-L-Start on. I ran my chassis battery down 2 or 3 times in 3 years before it died. When I replaced it, I installed a Trik-L-Start and have never had another problem in the 4 years since.
To install, find the relay that connects the two sets of batteries together. The Trik-L-Start has 3 wires. Wire one is to the chassis battery side of the relay. Wire two is to the house battery side of the relay. Wire three is to vehicle ground. Simple. Works.
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB