I’m not sure your unit would be wired for a second AC. I know my 2016 BSS could not get a second AC nor would Newmar upgrade it to 50 amp service. I DID upgrade to the 15k heat pump and glad we did. Not only does it fill a bit better but also works great to warm the place on cold nights with out using the furnace. Once the HP determines it can’t generate heat it will auto switch to the furnace.
BTW the 15k is not enough in really hot areas, unless you can find some shade.
2016 Newmar Bay Star Sport 3004
2015 Jeep Wrangler 2DR 4WD Sahara, Automatic, Hard Top