Inverters are not essential but, nice to have. Our grand kids travel with us sometimes and to keep them entertained while traveling, we play movies on the DVR and don't really want to run the generator.
You want to determine what size inverter you would want. We installed a 1000W and it's plenty. No, we can't run the AC or microwave off the inverter. But, low wattage toaster, coffee maker...no problem. Just be aware of how many watts each appliance uses.
You might also consider installing a automatic transfer switch. Pretty sure the FR3 still doesn't come with one from the factory. I did and now I don't have to plug the shore power plug in to the coach. It's all hardwired together.
Smooth Roads, and, Drive 'em Safe
Curt & Isabel, & 9er (our Goldendoodle)
2014 Forest River FR3 30DS (Beasty)
2014 Honda CRV EX-L (toad)