Per the "standard" Isata 5 120 V diagram, all the domestic 120V service comes through the inverter, which is on leg 1, so that provides a hard 30 amp limit on those items.
But some 28ss (I believe this includes your coach) have a separate breaker on line 2 for the outside kitchen stove. So the FB OP could add a breaker feeding a separate outlet from leg 2. This diagram shows that configuration.
2021 Isata 5 28ss 4x2 / 2020 JLU Rubicon
Prior: 2016 Lance 1995 / Ram 1500 Eco Diesel
2012 Lance 1575 / 2015 Jeep JKU Rubicon